OK I have now completed a firmware upgrade on the Inspire 1 and will detail down the route i took.

Firstly i was upgrading from 1.5.00.30 and there are a few things to note.

The firmware upgrade on the aircraft is done from the micro SD card.
The firmware upgrade for the transmitter is done via The Go App and NOT the micro SD card.

This  is important, also ignore what the Go App says when you turn it on, if i  had updated the transmitter following the Go app i would have been in a world of pain.

These are the steps i took.

Preperation
1. Download the firmware update from the DJI Website, extract the zip file to get the .BIN file.
2. format the micro SD card in the inspire 1 (i did it via the go app as i know this works)
3. Copy the firmware .BIN file onto the micro SD card and put it onto the root of the card.
4. Take the inspire 1 out of transport mode and fit the camera gimbal
5. Make sure your transmitter(s) and flight batteries are at least 75% chaged to be on the safe side.
6. Make sure your DJI GO App is up to date, the current version is 2.8.1
6.. TURN OFF EVERYTHING.... AIRCRAFT, TRANSMITTER and GO APP, this is the best place to start to make sure nothing goes wrong.


Inspire 1 firmware upgrade
1. Insert the micro SD card into the slot in the camera
2. Make sure your transmitter is turned off.
3. Power up the Inspire 1
This  will now go through its start up proceedure, it will sart to bleep with  4 short tones and then a pause so dddd - dddd - dddd -dddd and so on.  This is letting you know thet the firmware upgrade has started.
IMportant.....  be patient it takes time, in my case it took around 15 mins to do the  firmware upgrade, do not be tempted to power it off, the light at the  back of the inspire will flash in various colours and patterns
but ignore it.
Wait  for the tone out of the inspire to change to one long beep and two  short so d-dd  d-dd d-dd and so on, this is letting you know that the  Inspire 1 firmware upgrade is completed.

4. power down the  Inspire 1 and take out the micro SD cardand put it into your computer,  on this card you will find a .txt file, open this and confirm that the  firmware upgrade has been sucessful.
5. do not remove the firmware  .BIN file off the micro SD card, you will need this latter to upgrade  the firmware in the batteries. Better to do it now than in the field.
6. Reinsert the micro SD card in the Inspire 1 but do not power it up at the moment.
Thats the Inspire 1 upgraded.


Transmitter upgrade.
This is done from the DJI Go app.

1.turn on the transmitter and connect it to the ipad.
2. Run up the Go App and connect it to camera view.
3. Press the status bar next to the DJI logo in the top left, it will say aircraft disconnected.
4.  You will see a red triangle with transmitter firmware needs updating.  This is done via the internet so make sure you have a good wifi  connection to the internet to do this.
5. Follow the prompts to do  the firmware update, again be patient, you will know when it has updated  the firmware on the transmitter as it will tell you and you will see a  green tick on the screen.
6. Power down the transmitter, asnd back up again, power up the Inspire 1 and then the Go APP.
7. In the Go App press the general settings button (top right of the screen 3 dots.
8.  Go to the bottom of this screen and press about., this should now show  you that the aircraft and camera is on version 1.8.01.00 and the  transmitter is on 1.6.0, this is the case on my setup.

Batteries
Yep these need doing as well but you have already done one on the initial firmware upgrade of the Inspire 1.
Any additional batteries will need to be upgraded but this is straight forward if you have followed the above proceedure.
As  you still have the firmware .BIN file on the micro SD card that is in  the camera gimbal you have the files you need to do this, now you see  why it was left on there.

1. Unplug the battery in the Inspire 1 that you used to do the firmware upgrade.
2. plug in a battery that needs to be upgraded (at least 50% power)
3. Turn on the Inspire 1
4.  The inspire 1 will go into the firmware upgrade process again but this  time it will only update the battery firmware as that is detected. This  is a lot faster than before and only took me a few minutes but best to  do it in a workshop and not the field.
5. Follow the bleep tones as before for the Inspire 1 firmware update, again be patient, its so worth it in the long run.
6. Once the firmware update has been done power down the Inspire 1 and repeat for all of you batteries.

Ok  thats the firmware upgrade done in the Inspire 1, camera, batteries and  transmitter but you are not quite done yet. The final step is  important.

REMEMBER
RECALIBRATE THE IMU, GIMBAL AND TRANSMITTER before flying, this is good practice after every firmware update.
On your first flight after a Firmware update make sure that all functions  and controls work as expected and that includes landing gear and  returnto home.

I hope this information helps and i would also  like to thank Donnie for his help in putting me on the right path for the firmware upgrades.

Thank you for taking the time to put these details together. Excellent guide!

These detailed procedures can be supported and  supplemented by first reading DJI Firmware Update Instructions Guide. This is a combined guide for both the Phantom and Inspire but contains additional caveats and tips to supplement the above procedures.

Thanks again, and always fly safe!

P41 I have made a copy of this page ( Of course hope ok with you ) and also made it on of my Favorites so I can make reference to it in the future for other members as well.

Also You have Terry  Lewis ( Man is  a Genius )  Blessing so you are doing VERY well Indeed !  Thanks again!

Donnie

Thank you for your kind comments, this is the idea of a furum, to share experiences and knowledge, it is all too easy to bash manufacturers and most of this time this is born out of frustration at not being able to find the right information. I think it would be a massive benefit if DJI if they could write upgrade instructions that are clear and concise and broken down into the correct order and sections.
I have been away from this forum for quite a while developing parachute recovery systems using APM and DJI so its good to be back being a bit more positive.

Nice summary and great detail. Thank you for taking the time and sharing this on the forum. This information is very useful to those new members that have not gone through this process before and a reminder to the older guys.   

Well Done
Rich

Thanks for posting this.  I had forgotten how to find the controller firmware upgrade and I was having the inevitable problem of my bird not talking to my controller after installing the latest firmware in my Inspire.

Thanks again.
Steve

Hi,
I've done all this steps, and after updating i keep on getting "No Signal" , everything works, exept the video feed.
Sometimes it work for a will, them it stops...
Should i reverse to previews firmware in the aircrat and them the remote?

Thanks.

project41,
Excellent summary of how to do it correctly.  
Your,
"REMEMBER
RECALIBRATE THE IME, GIMBAL, AND TRANSMITTER (RC) before flying..." is absolutely correct.  Always check mod values before flying as well.  Concur on a "test flight".

I would like to add: that because BATTERY FIRMWARE WAS INCLUDED IN 1.8.1.00, I
recalibrated all of my batteries per the note at the bottom of page 23 in the users manual. ("To effectively calibrate battery capacity...").
One never knows just exactly what it in a firmware update and I prefer to confirm reliability and performance with my own "regression testing", even though it's a pain at times.
Cheers,
60M