That is correct, a lot of NES rom hacks were not tested on original hardware (some were but most aren't). It will require many OS updates from krikzz to fix the bad headers in the roms. Of course you can fix your own headers as well, but it's not recommended unless you have experience with programming or dumping NES carts. Everdrive N8 will take time to make close to 100% but I feel it will get there, and surpass the powerpak quickly