Yes, succeeded.
I own a TT Go 730 and had een sd card of max 2GB.
I have made the firmware-update exactly as you wrote.
After the firmware update I put my 8Gb sd card into my TT Go 730 with navcore 9.702 and the latest Truckcard ( version 1.030). And Yes, I had immediately a gps-fix.
15 minutes later I turned my TT Go 730 on again, and I had again a fast gps-fix.
Question: Does this solution also works with the Tom Tom Go 7.000?