37xx is very hard to be bricked. !
Just get rebooting loop with the wrong files inside. --> Cure Rom is the answer.

Just get in rebooting loop. (for flashing with the same hwid rgn file)--> The solution is flashing back with original firmware.
Just say "Software Missing" (for flashing with different hwid rgn file) --> The solution is flashing back with original firmware.
Just say "GIR Mismatch" (for flashing with the wrong resources.bin) --> The solution is flashing back with original firmware.

But I agree with you about the map in sd card.