I've made teardown and cleaned the whole console by all ways including cartridge connector...I suggest opening the system and doing a complete cleanout. The cartridge connector itself may be damaged. There are fixes for that but it involves soldering
Learning soldering, earning soldering skills, and change damaged part (DIY); So I think the CPU is damaged after testing everything meticulously. As far there's not so much knowledge on how to fix or handle this, buying another N64 will be a second option.I wanna ask what's cheaper at this point I would assume soldiering would me more expensive than buying a new console all together if one doesn't have the experience before hand.
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Sorry for not helping ;-; I just wanted to put that out there