Just setup my new spark fly more using Android and the app throws a "locked" error. Using v4.3.8 I read comments dating back year(s) and the common theme is to back out to an older version. Does this mean the controller and drone software must also be downgraded? How the heck have DJI not been able to solve this after so long??? It's VERY frustrating.

Hiya, I had exactly the same issue.

Uninstall the software from your Android device only, and then re-install the earlier version.

It'll work fine then.

Ok thanks is this the right version?

https://www.apkmirror.com/apk/dji-technology-co-ltd/dji-go-4/dji-go-4-4-3-4-release/

It looks like I used 4.1.15 - I can email you the apk I used if you want, just PM me your email address

I'd just try 4.2.21!

S-e-ven Posted at 1-6 05:18
I'd just try 4.2.21!

Ok I'll give those a try.

Is there any way we can draw the attention of DJI on this? It seems ridiculous that they have crippled there authentication to stop fraudsters to the point they are screwing with their legitimate customers.

I am considering taking the damn thing back to the retailer for a refund.

As a software guy, I can't believe they've let this sit, but the problem has been there since April.

Can @DJI Mindy or @DJI Stephen please offer some guidance here?

A LOT of people have this problem.

Did you upgrade Spark and RC to latest firmware?

MavSpa_user Posted at 1-7 03:19
Did you upgrade Spark and RC to latest firmware?

I had spent a whole afternoon upgrading the firmware on both devices which timed out 2-3 times, not a pleasant experience - but it worked in the end. So you can imagine my state of mind when I found the app reporting that the drone is "locked" with no explanation or diagnostic information whatsoever.

drone lock is most of time not completely upgrading fw.I will sent you a PM.Also you have to update fw with each battery

S-e-ven Posted at 1-6 05:18
I'd just try 4.2.21!

Tried that... Still locked...

DJI support recommened I run the assistant and upgrade (but already on V01.00.1000) So i refreshed it regardless and installed/uninstalled the app. No cigar..

This has gone from bad to diabolical.

did you check your personal message? right above menu, under the ringing bell
And did you update FW with all of the battery's???

Ok I switched to the spare battery and got a firmware warning. Updated and for the first time didn't see the locked warning. And this is on the new Android 4.3.10

Also did this on a Pixel phone instead of a dedicated Samsung S5 so not sure which of these 3 variables fixed it.

The real test is tomorrow where I try and fly the bird. Thanks to everyone for their help

Flew nicely using the Samsung S5 with OTG.

No idea what fixed the problem though.