Well, I at least expected to have different blue screen error with card reader. And no, it's actually my first time hard modding, so I'm just going through all card readers I have avaliable to see if it'll work. Soldering I've done you can check in this post - https://gbatemp.net/threads/tutoria...-xl-n3ds-n3ds-xl.414498/page-113#post-7449203 There was already advice about bad CMD and CLK soldering, so I might try to redo all of it and use slightly less solder overall and see if it'll change anything. Also, yes, I do have multi-tester with continuity. Any advices on what I should try and check with it? Also, on matter of MCU - I still can't say if it's bricked, but visually MCU chip looks fine. Not burned out, at least.