CISCO SPA504G

All information relating to the CISCO SPA504G 4-line IP phone.

Well well well. You've bricked the phone. Well done. This can happen when you become a little too...

UART serial Once removing the case, there is a five pin header on the rear of the device. Four o...

The SPA504G uses the Texas Instruments TNETV1057ZDW processor on a Titan SoC, pictured below. It ...

Extra memory (beyond what is provided on the SoC) is provided through the W9812G6JH-6 IC, manufac...

Whilst no information could be found online regarding the MX T122541 IC, Macronix is semiconducto...

When connecting to the UART serial header, the following is printed to the console during boot: B...

The SPA504G uses the PSPBoot boot loader. This is an old bootloader with not much info out there ...

The logic to validate the firmware bundle begins at: libupg_validate_firmware_mem. This is called...

The firmware file is made up of the following components, each located in the firmware file after...

Extracted using the SPA504G extraction utility available here. spa50x-30x-7-6-2f_artefacts.zip