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Phone Does Not Boot
CISCO SPA504G
Troubleshooting
Well well well. You've bricked the phone. Well done. This can happen when you become a little too curious about what the fmt commands do. All is not lost, you can most likely recover the phone with a bit of effort. Requirements Access to the phone's UART debu...
Boot Loader
CISCO SPA504G
Software
The SPA504G uses the PSPBoot boot loader. This is an old bootloader with not much info out there but there is one piece of documentation floating arround and can be found here. The bootloader can be found in the firmware update files: psbl.elf Recovery Mode Th...