For informational purposes, I successfully reverted firmware from 13.02 to 13.00 on a PS4 Fat CUH-1216A - SAC001 board with RPI Pico following the Legit Core OS Patch guide (this guide uses Teensy) on YouTube.
Software used: PS4 Wee Tools 1.0.4
Pico-serprog for nor dumping and flashing via...