Maybe it's because I'm on 4.1.0. There wasn't an error code, but the error was:
OpenFileSystemWithId:101: File @Sdcard://tinfooil/nsp/XXXX.nsp/xxx.cnmt.nca is unreadable! You may have a bad dump, fs_mitm may need to be removed, or your firmware version may be too low to decrypt it.. Error codDone!
When I used the bypass firmware check option, I still got an error when installing. Others who did as well said that updating the firmware worked for them...
Yes, it seems like there's no way around updating to play newer games. I followed this guide (https://gbatemp.net/threads/play-nsp-games-for-higher-firmware-on-lower-firmware-reinx-hactool-tinfoil-extracted-nsp.512921/) to no avial, I still get an error when installing via tinfoil. So it seems...
I'm on 4.1.0 right now and plan on upgrading to a higher firmware version, because installing some software via tinfoil isn’t working. So I can use ChoiDujourNX to upgrade and then disable autoRCM, it'll burn the fuses and I can't downgrade. I don't really want to use autoRCM, since I don't use...
I would think that a 1:1 copy would have anything that the original copy would have, including the MD5. Nintendo is still making the same kinds of DVD's.