Unfortunately, the normal GCD update procesdure won't work with the firmware patched by me, don't even try. You need to replace it first.

Please do the following:
0) Remove all the GUPDATE.GCD files from the internal flash drive.
1) Load the original 3.50 GCD with RGN_Tool; set the firmware version equal to 3.49; clear the mark near the 0x66 region; save the firmware as RGN file; flash the RGN file with updater.exe.
2) Perform the normal GCD update procedure with the original 3.50 GCD.