Step back and stop what you are doing. The APIM can be saved at this point, most likely, but not guaranteed.
Since you have not reformatted the unit and only performed a Ford released packaged update, we can assume this is not a black screen as a result of MY20+ driver issues. Therefore, this leads to a corrupted strategy file.
Have you changed the firmware on this APIM with FORScan? But, quoted from APIM Firmware Flash Rescue - Ford / Information - CyanLabs Official Community, specific to the early Sync modules:
Uploading strategy file GB5T-14G374-CB may brick the module. Solution is to upload GB5T-14G374-CD instead of GB5T-14G374-CB.
The -CB file can be an issue and should be replaced. You will need the paid version of FORScan and a quality adapter like the OBDLink EX or VGate USB. This is a lot cheaper and worth a try since this is a known issue with this Strategy file.
So can you please explain this quote? What exactly were you doing that lead to the battery condition?