A simple script to brick the BCT

BrickBCT.py

import os

def do_brick(file, bct_offset, unbrick):
    os.lseek(file, bct_offset + 0x0530, os.SEEK_SET)
    print("Org = " + str(os.read(file, 1)))
    os.lseek(file, bct_offset + 0x0530, os.SEEK_SET)
    new_val = b'\01' if unbrick else b'\00'
    print("New = " + str(new_val))
    os.write(file, new_val)

unbrick = False
file = os.open("/dev/mmcblk1boot0", os.O_RDWR)
do_brick(file, 0x000000, unbrick)
do_brick(file, 0x004000, unbrick)
do_brick(file, 0x008000, unbrick)
do_brick(file, 0x00C000, unbrick)
os.close(file)