Normal method of debrick by erase the flash and sprogram the boot.
erase 9fc00000 200000
ldram boot (good firmware)
sprogram 9fc00000 200000
Method 2.
detect
ldram boot (Select proper boot file)
erase boot
sprogram boot (Slow programming)
Power off and on SB5100
detect
ldram 9fc00000(Select the backed up file)
program 9fc00000 200000
cmpram 9fc00000 200000
erase 9fc00000 200000
ldram boot (good firmware)
sprogram 9fc00000 200000
Method 2.
detect
ldram boot (Select proper boot file)
erase boot
sprogram boot (Slow programming)
Power off and on SB5100
detect
ldram 9fc00000(Select the backed up file)
program 9fc00000 200000
cmpram 9fc00000 200000