I want to add my own experience updating AZ-GTi firmware
I tried to update its firmware over wifi. The software turned out to be very finicky and failed at ~35%. The popup message suggested to reboot the mount so I did it!
That was a mistake! (if you encounter this message please ignore it and just keep trying to flash until it succeeds)
Once I rebooted the mount it stuck in "Firmware update" mode. You can clearly recognize it cause the mount was blinking three times in a row. If you encounter this do not despair. I do not think it is possible to fix this problem without additional hardware but I manage to buy USB->RJ12 cable with FTDI chip. This cable enable you to connect AZ-Gti mount to a computer and control it using various software. What it also enables is to use SkyWatcher over-the-wire firmware flasher which will permit you to flash the firmware if you directly connect your mount to PC
Note I followed somebody else's advice and I flashed the original version of the firmware and only then I flashed experimental EQ. I do not know whether one needs to do this in order to restore the mount