I did not get any errors about checksum mismatch when I patched. I'm using Command and Conquer its the only cart I have and its complaining about no EEPROM so I can't save. Is there a certain cart you have to use it's been over 10 years since I played with my N64. Modding it to use a CF card which peaked my interest to test it again.
Yeah, C&C uses FlashRAM for saving, but at least it has the right CIC. See this list and get yourself a cart with a 6102 CIC and a 16K EEPROM off of eBay or whereever. Iirc most Z64 users got by with owning just Mario 64 (4K EEPROM) and Pod Racer (16K EEPROM), using the bootemu for different CICs where necessary and patches for the handful of games using Flash, so I recommend doing the same. Or, you know, just get an ED - my Z's been collecting dust since mine arrived. (Oh and please do not quote my full post every. single. time. your're answering, thanks.)
Use the WinAPS to patch er I played through it 100% on my 64drive , absolutely lovely ! No , I did not wait all these years to play I've owned the cartridge since around launch , this far more convenient though ! Cheers much Dextrose !!!