Did your friend update from pre 4.0.0 to his current FW officially or using homebrew? It sounds like his game card slot firmware may not be updated meaning it won't work on any FW at or above 4.0.0.I have a problem.
I get a switch from my friend.
He has 7.0.1 and use atmosphere with auto rcm.
He cant play games with catridge and dumps. The catridge freeze or get an error.
The dumps are blackscreen but you cant back in the home menu.
I try brickmii to count the fuse. They say 9 fuses (raw value 0x000001ff)
How can i fix them?