ShootTheCore
Legendary
A recent update_all broke the Neo-Geo core on my setup. Using the original BIOS gives a Z80 Error, and using the UNIBIOS leads to the monitor test when trying to load a ROM.
It sounds like your core download is corrupt. Load the SD card up on a computer, browse to the _Arcades/cores folder, and delete the Neo Geo entries. Then load the SD card back up in your MiSTer and run update_all again.
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