HP-41CL Update Challenge

[wbvreeuwijk]

Yes, all of these applies :-)

My initial assumption was false, so using the serial connector and loading the update ROM in RAM through the serial it and then using the clupdate java program fixed it. It seems I borked the update ROM which meant that subsequent usage to update other ROMs with it corrupted these ROMs as well. Luckily I found the instructions to use the YFNZ ROM instead of YFNX for loading a ROM through the serial connection.