I 100% agree with you, that's not something i'd like to do, i personally wouldn't have thought of doing that. That's what the seller told me so i tried it too.
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Pushing on the INSTR PRESET button can also sometimes cause the same thing to happen, it's just less likely to do it.
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Thanks everyone for the help, i'll probably be back in a few days after i'll receive the logic analyser and do signature checks. If i can't find any issues then i'm gonna wait till i find another broken 8568a and try swapping the A15 board.