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New firmware and app issue - OTG Android
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2154 43 2018-7-20
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djiuser_o6c2Fr0kQN3G
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So finally tested the OTG support with the new firmware (ac and rc) new dji go 4 app .21 (Android)

-no problems updating, quick and smooth
-restarted with every update
-IMU and Compass calibrated after firmware updates
-sensors are clean
-tested with full battery
-no attachments (batt lock, prop guards,etc)

-issues found while on OTG:
While below 5 feet, frog leaping, sudden descending specially while landing. Random disconnects (aircraft disconnected)

Made sure the cable is firmly in place, while going wild have check the IMU and compass sensors all green.

While above 5 feet: none

Restarted all components (phone, ac, rc)

Tried using wifi and not OTG:

Everything working ok.

Phone: Mate10


2018-7-20
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S-e-ven
Captain
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Frog leaping?
Sudden descending?

That does not sound promissing, even (in special) if under 5"

Check your flight log, please, do you find cell deviation somewhere in it?
2018-7-20
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djiuser_o6c2Fr0kQN3G
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S-e-ven Posted at 2018-7-20 19:20
Frog leaping?
Sudden descending?


Yeah weird, no cell deviations. Have also tested with 2 batteries.

Remember none experienced in wifi mode, only in otg. Sparks stable.

Have submitted a bug report through the dji go 4 app together with the flight record.
2018-7-20
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S-e-ven
Captain
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Assistant 2 is still offering downgrade to .900, .800, .701?
Have you tried to go back?
2018-7-20
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djiuser_o6c2Fr0kQN3G
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S-e-ven Posted at 2018-7-20 20:42
Assistant 2 is still offering downgrade to .900, .800, .701?
Have you tried to go back?

Not yet, will use wifi in the meantime.
2018-7-20
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Charliejspark
Second Officer
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Interesting.  My firmware update went OK. Little problem with RC but all worked in the end. Have now test flighted. using OTG with my Samsung 7 everything appears to work OK. No leap frogging! Good clear real time video link. 'Aircraft disconnected' appeared too often but overall pleased.
With my Samsung 10.1 tablet not so good.  Terrible video lag and fragmentation to the point of useless. Worked fine on DJI Go 4 4.2.16 so may have to go back to that but how will the new firmware update  work with the older DJI?  I suspect the problem is that  the tablet in Android 5.1 and hence does not like the newer DJI Go 4s.
2018-7-21
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djiuser_o6c2Fr0kQN3G
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Charliejspark Posted at 2018-7-21 09:56
Interesting.  My firmware update went OK. Little problem with RC but all worked in the end. Have now test flighted. using OTG with my Samsung 7 everything appears to work OK. No leap frogging! Good clear real time video link. 'Aircraft disconnected' appeared too often but overall pleased.
With my Samsung 10.1 tablet not so good.  Terrible video lag and fragmentation to the point of useless. Worked fine on DJI Go 4 4.2.16 so may have to go back to that but how will the new firmware update  work with the older DJI?  I suspect the problem is that  the tablet in Android 5.1 and hence does not like the newer DJI Go 4s.

Can you try to hover at 5ft then try to descend to 2 ft, then land?
2018-7-21
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Charliejspark
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djiuser_o6c2Fr0kQN3G Posted at 2018-7-21 18:37
Can you try to hover at 5ft then try to descend to 2 ft, then land?

Yes I see what you mean.  I launch and recover to hand but it is not happy landing on my hand any more, and the props do not turn off.  Will experiment some more.
2018-7-22
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AC5FF
Second Officer
Flight distance : 65194 ft
United States
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Uuhhhggg
I logged in here as my AC and RC are updating...   Maybe I should have waited???  Figures.
AC had updated fine.  RC is going slow, hopefully soon I can run outside and test it out.
2018-7-22
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AC5FF
Second Officer
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Happy to report back.  No apparent issues here.  Flew high/low, regular, tripod, sport, with no issues.
Was in the neighborhood so probably was out a max of 600' but just happy all went smooth.
2018-7-22
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Charliejspark
Second Officer
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djiuser_o6c2Fr0kQN3G Posted at 2018-7-21 18:37
Can you try to hover at 5ft then try to descend to 2 ft, then land?

OK I have flown again and NO trouble hovering or landing.  Was still getting aircraft disconnected but I have now changed the order I boot up in. I now  turn on RC and when red LED stops flashing connect the OTG. Then run GO 4 (should start automatically) THEN I turn on the spark.  Using this order I have had no aircraft disconnect with 3 batteries.
See what happens tomorrow - every flight a new adventure!
2018-7-22
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djiuser_o6c2Fr0kQN3G
lvl.2
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I have refreshed my firmware with all batteries using dji go 4, while I only tested wifi will test otg when given the time.
2018-7-22
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ernieken
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I keep reading that people are calibrating compass/IMU while the apps isn't asking for that. I thought calibration is only needed when the app asks you to calibrate.
I fly my Spark for more then a year, 100+ flights, always update firmware to latest version, been in several countries and never calibrated compass or IMU. No problems so far.
So maybe some people are calibrating too often?
I fly with (and sometimes without) OTG cable on Samsung Galaxy S6 (with Android 7).
2018-7-22
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Jasta ~
Captain
Flight distance : 294272 ft
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I saw too many problems with the new firmware.
2018-7-22
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chenfuyin
lvl.2
Vietnam
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I lost front LEDs in RED
Signal seem weaker, lost transmission
2018-7-22
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DJI Tony
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Hi, sorry for the troubles that it caused, do you mind uploading a short video of the issue using google drive and drop-box for further evaluation? Thank you.
2018-7-23
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djiuser_o6c2Fr0kQN3G
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DJI Tony Posted at 2018-7-23 11:03
Hi, sorry for the troubles that it caused, do you mind uploading a short video of the issue using google drive and drop-box for further evaluation? Thank you.

I formatted my sd card, and refreshed my firmware with all batteries but have not used my spark due to bad weather. Will try again and let you know thanks.
2018-7-23
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Sarperdewd
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DJI Tony Posted at 2018-7-23 11:03
Hi, sorry for the troubles that it caused, do you mind uploading a short video of the issue using google drive and drop-box for further evaluation? Thank you.

Tried it again, this time its worst than ever.

its exactly the same as this:
2018-8-4
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Sarperdewd
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Sarperdewd Posted at 2018-8-4 18:10
Tried it again, this time its worst than ever.

its exactly the same as this:

DJI Tony Posted at 2018-7-23 11:03
Hi, sorry for the troubles that it caused, do you mind uploading a short video of the issue using google drive and drop-box for further evaluation? Thank you.

Tried it again, this time its worst than ever.

its exactly the same as this:



but that video has a workaround, even if I push the stick up gently it will just descend and bounce.

also downgraded to firmwares:

AC: .701
RC: .400
App: .16

I am still having the same problem, the sensor readings are all green.  There are no error messages, satellite lock is more than 10.  Spark did not crash, started to have this problems after the upgrade of the .1000 ac and .600 rc firmware.

Also tried unlinking and relinking the ac and rc, but the same.

I was able to reset to factory settings using the DJI assistant 2 via PC.  I reported this as a bug before (on the day I posted this issue) via DJI app but no communications whatsoever from DJI.

My spark is currently grounded, as I also used another phone but still the same. I have researched all the possible solution in this forum and google to no avail.
2018-8-4
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Sarperdewd
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Forgot to note that I also used the spare propellers since I have the FMC and its the same thing.
2018-8-4
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S-e-ven
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Sarperdewd Posted at 2018-8-4 18:20
DJI Tony Posted at 2018-7-23 11:03
Hi, sorry for the troubles that it caused, do you mind uploading a short video of the issue using google drive and drop-box for further evaluation? Thank you.

"There are no error messages, satellite lock is more than 10."

Do you wait for "homepoint recorded"?
Not that it should matter, usually, but it seemed to do so, sometimes.

Your Spark got crazy like this AFTER the newest FW updates?
Never before?
Check your flight records of these events, please
http://www.phantomhelp.com/logviewer/upload/
Cell deviation in it, somewhere?
2018-8-4
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Sarperdewd
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S-e-ven Posted at 2018-8-4 20:42
"There are no error messages, satellite lock is more than 10."

Do you wait for "homepoint recorded"?

Yes, did wait for homepoint recorded, no cell deviations on both batteries. Both batteries have the same problem.  Never had this issues before the update.

Any other thing I can check?
2018-8-4
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S-e-ven
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Sarperdewd Posted at 2018-8-4 20:58
Yes, did wait for homepoint recorded, no cell deviations on both batteries. Both batteries have the same problem.  Never had this issues before the update.

Any other thing I can check?

Did you check in the phantom uploads for cell deviations?
2018-8-4
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Sarperdewd
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here's one:

http://www.phantomhelp.com/logviewer/8N0K5G853YU946TWPVHO/

this is where I had problems
2018-8-4
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Jakab Gipsz
First Officer

Hungary
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Charliejspark Posted at 2018-7-21 09:56
Interesting.  My firmware update went OK. Little problem with RC but all worked in the end. Have now test flighted. using OTG with my Samsung 7 everything appears to work OK. No leap frogging! Good clear real time video link. 'Aircraft disconnected' appeared too often but overall pleased.
With my Samsung 10.1 tablet not so good.  Terrible video lag and fragmentation to the point of useless. Worked fine on DJI Go 4 4.2.16 so may have to go back to that but how will the new firmware update  work with the older DJI?  I suspect the problem is that  the tablet in Android 5.1 and hence does not like the newer DJI Go 4s.

No! Somewhere I read that DJI makes it harder for hackers to encrypted the data flow from AC (video feed and telemetry data) so it needs more resources to decrypt. A 4.1.15 is absolutely right: there is OTG and everything you know. I do not even know why everybody refreshes without reason ... You have to upgrade Mavic Air because it supports the new software that is being upgraded, not because of Spark.
2018-8-4
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Sarperdewd
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S-e-ven Posted at 2018-8-4 21:10
Did you check in the phantom uploads for cell deviations?

Well here it is:

Good flights:

http://www.phantomhelp.com/logviewer/46US102DZIOHZPM4LFBW/ - no frog leaping (descending when you push the stick up - none)
http://www.phantomhelp.com/logviewer/EX02AQ8N99UR9GSEU5H6/ - no frog leaping (descending when you push the stick up - none)

Bad Flights:

http://www.phantomhelp.com/logviewer/7GGQ49OB2RAF3Z82OOXU/ - frog leaping (descending when you push the stick up - yes)
http://www.phantomhelp.com/logviewer/AF0S788D5QTH5XS4RNHW/ - frog leaping (descending when you push the stick up - yes)
http://www.phantomhelp.com/logviewer/IGP9F9XUERJYEYILZO6D/ - frog leaping (descending when you push the stick up - yes)

Please help anyone
2018-8-4
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Jakab Gipsz
First Officer

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Charliejspark Posted at 2018-7-22 10:37
OK I have flown again and NO trouble hovering or landing.  Was still getting aircraft disconnected but I have now changed the order I boot up in. I now  turn on RC and when red LED stops flashing connect the OTG. Then run GO 4 (should start automatically) THEN I turn on the spark.  Using this order I have had no aircraft disconnect with 3 batteries.
See what happens tomorrow - every flight a new adventure!

Only for someone who always pokes the firmware and the DJIGo application ...
2018-8-4
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Jakab Gipsz
First Officer

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Sarperdewd Posted at 2018-8-4 18:20
DJI Tony Posted at 2018-7-23 11:03
Hi, sorry for the troubles that it caused, do you mind uploading a short video of the issue using google drive and drop-box for further evaluation? Thank you.

Do the down-view sensors are clean?
Have you tried using a DJ assistant to do a factory reset?
2018-8-4
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Sarperdewd
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Jakab Gipsz Posted at 2018-8-4 23:30
Do the down-view sensors are clean?
Have you tried using a DJ assistant to do a factory reset?

Yes cleaned them, and did a factory reset already even a firmware refresh.
2018-8-4
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Sarperdewd
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So today I was able to test it but only indoors, installed prop guards and took off as OPTI mode, I had no problems with whatsoever.  It was steady as a rock.
2018-8-5
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S-e-ven
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Sarperdewd Posted at 2018-8-4 23:12
Well here it is:

Good flights:

And bad flights have all  cell deviation, 2x 1 sec, one time 0.4 secs, I think
I could not find that on your good flights.
Perhaps because a "good flight" log is a lot longer and this cell deviation, <-,1xxv, is not show.
But even searching with 0.1 doesn't get this red marked cell deviation

You still have warranty?
I got tolf from DJI service, it is a powermanagment failure
(FAQ -answer?)

2018-8-5
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Sarperdewd
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S-e-ven Posted at 2018-8-5 07:22
And bad flights have all  cell deviation, 2x 1 sec, one time 0.4 secs, I think
I could not find that on your good flights.
Perhaps because a "good flight" log is a lot longer and this cell deviation,

Those cell deviations were the product of forced landing I think, I grab the spark and turned it sideways to turn it off.  Yes I still have a warranty.  

Do note however that during the take off of the bad flight records, it frog leaps already. No cell deviations there.
2018-8-5
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S-e-ven
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Sarperdewd Posted at 2018-8-5 07:51
Those cell deviations were the product of forced landing I think, I grab the spark and turned it sideways to turn it off.  Yes I still have a warranty.  

Do note however that during the take off of the bad flight records, it frog leaps already. No cell deviations there.

Possible, but on one log its 5 seconds before it lands/get tilted.
And I assume, if you would be able to get in in the air
(try CSC, switch to Sport, for a try? Worked for me some starts)
and would fly the battery longer, it would still be there, where it is now: minutes before the end of the flight.
I have lots of this cell deviation recorded.
one time, 2 times in the log, mostly 1 second , sometimes 2 secs in a row.
Not at all connected to the starting movement.
But it is only in the logs with whohoo bumpstarts / power failings
2018-8-5
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Sarperdewd
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S-e-ven Posted at 2018-8-5 08:03
Possible, but on one log its 5 seconds before it lands/get tilted.
And I assume, if you would be able to get in in the air
(try CSC, switch to Sport, for a try? Worked for me some starts)

Csc?

Ill try to take off via sport but not familiar with csc.

I have downgraded my app to v.14 and will try tomorrow if weather permits. But this is just ridiculous DJI.
2018-8-5
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S-e-ven
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Sarperdewd Posted at 2018-8-5 08:08
Csc?

Ill try to take off via sport but not familiar with csc.

Combination Stick Command (CSC) - both sticks down and to the middle
2018-8-5
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S-e-ven
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The other point, you need to bring it up 2-3m.
Mine was at that height still whoohoo ("falling" 10-50cm), but not bumping on the ground anylonger.
So iI did fly the battery.
And in the end the whoohoo was gone

Question: Do you get reminded, very now and then, to calibrate the IMU
I had it often, one day almost every battery, but mostly a bit "normal behavior" for some time
Btw: You could do that for a test, anyway! Orange is not the new green but perhaps the new red!
2018-8-5
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S-e-ven
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Sarperdewd Posted at 2018-8-5 07:51
Those cell deviations were the product of forced landing I think, I grab the spark and turned it sideways to turn it off.  Yes I still have a warranty.  

Do note however that during the take off of the bad flight records, it frog leaps already. No cell deviations there.

"Yes I still have a warranty. "

That is good!
My experience was that even the workaround wasn't working always.
And in the beginning it was only on one battery, in the end it "bumped" on all, sometimes, I think.
I couldn't find a trigger for it, so had videos and flight logs analysed, but : "All good, Spark follows RC input (rises if left stick pushed to the front). Which it did not really do.

Oh: Look at your flight record, in the app, with stick movements:
Does the record show xx-100% up, perhaps, but no altitude change?

If yes, open a case straight: You could have prove!
Also capture that behavior, best with RC and Spark in the picture.
2018-8-5
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Sarperdewd
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S-e-ven Posted at 2018-8-5 08:12
Combination Stick Command (CSC) - both sticks down and to the middle

Oh, yes did that had the props warmed up before taking off.
2018-8-5
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Sarperdewd
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S-e-ven Posted at 2018-8-5 08:21
The other point, you need to bring it up 2-3m.
Mine was at that height still whoohoo ("falling" 10-50cm), but not bumping on the ground anylonger.
So iI did fly the battery.

Nope, was not prompted for any IMU calibration ever. Just a compass once.
2018-8-5
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S-e-ven
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Sarperdewd Posted at 2018-8-5 08:37
Oh, yes did that had the props warmed up before taking off.

yep, for 5 secs or so, says the log.
Did you try very little input , left stick, for take off?
That is the workaround, slow starting
Sport, however, would (did) try the opposite!
2018-8-5
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