When I upgraded the aircraft to 1.3.2, and used the GO app, I had FPV as expected.  I then upgraded the RC to 1.3.2.  Waited till the LED went from blue to green as instructed (had to use USB stick method) and the text file said "success".  Have never seen FPV since, even on the ground.  App says "Disconnected".  I can fly the aircraft and tilt the gimbal with the RC dial, but no FPV.
So I think I somehow got a faulty installation on the RC.  I tried a re-install with the same firmware but nothing happens.  I formatted the USB stick and tried installing 1.2.8 - text file says firmware identical or older than current firmware.  Same thing happened with 1.1.9.  How can I force a re-install of firmware on the RC?
BTW- I have an iPhone 6+ and tried 4 different cables.  Deleted and re-installed the GO app twice.  Rolled back to Pilot app from iTunes backup - still says "disconnected".
DJI says I need to send it in for repair.  I REALLY would like to avoid that.
Thanks for any help.

Downgrading the RC is not currently possible although DJI will release the firmware files to do it soon..

What did the log file in the hidden folder say ( MISC/LOG )/ can you post it?

I don't find that hidden folder on the USB stick (I do have Show Hidden Items checked)  but these files were in the root:
P3_FW_GS_LOG.txt:
[1438717169.298013] RC upgrade log:
[1438717177.81406 ] start upgrade 13
[1438717197.303175] success
[1438717200.319511] start upgrade 14
[1438717223.409939] success

P3_FW_RESULT_GS.txt:
==========2015.08.04 19:39:29==========
Packet: /mnt/usb/P3S_FW_V01.03.0020.bin,
Upgrading ...
Result: Success

Exact same issue for me... Please help as there are many post upgrade no signal folks out there...