Simplex 4006 Boot Failure

I recently bought a used Simplex 4006-9102 control panel, but when power is supplied it fails to properly boot. Everything lights up for a second, it beeps then displays ‘Bootloader 1.01’ then ‘Checking for PC’ After that, the code verification stops at C, and it restarts. I was unable to find any solutions for this issue as it seems that not many other people have encountered it. Any help is appreciated!

Sounds like the firmware is borked… I’m less familiar with Simplex errors, but the late great @Retired_STR-SG (A former Simplex Technician) posted some info on a 4008 that may be helpful to you: Simplex 4008 possible problem - #6 by Retired_STR-SG