- Dec 15, 2009
A newly leaked Samsung Galaxy Tab firmware show that the Galaxy Tab have been shown to contain protected bootloaders that 'disables custom ROM flashing abilities'. Flashing to the leak has resulted in various reported unrecoverable bricks if Odin is used improperly to attempt to revert to a previous unprotected bootloader. If you want to maintain custom firmware flashing functionality, do not the JM6/A/C/D ROMs!
The result is that once flashed, you cannot revert to older/official/custom Samsung ROMs, and you are pretty much stuck using one of these four ROMs, as they are the only ones containing the right checksums.
This may indicate that Samsung is leaning towards limit custom firmware development by locking down the device.
Xda Thread: (WARNING! Do not flash jm6/A/C/D/E... Before reading this ! - xda-developers)
XDA News: Warning: Leaked Galaxy Tab Firmware comes with Protected Bootloader | xda-developers