PS5 EDM 010 boots to Safe Mode and cannot load Software

Hello - back ground information: I have a PS5 version 010 that was converted to a digital console from disc, the console boots up and shortly afterwards it becomes unresponsive and I have no choice but to pull the plug. I had replaced the south bridge and reflashed the BIOS chip prior to this issue since the conversion did not go well, and the issues is the same. I also reinstalled the software several times (safe Mode) to no avail. The UART does not throw any codes. After it freezes the unit does get hot.

After installation of a new SSD driver, the console boots to safemode but hangs up at “please wait” when attempting to reinstall software, I formatted the drive and installed fresh copy of the file from Sony.

The first time I went though this it took many attempts when finally the software took. Anyoen have any advice or input? UART does not through errors.

I managed to get past the hanging up and going to software installation but freezes at 99%. Besides reflashing the BIOS chip any diagnostics I need to perform to ensure its not a hardware failure?