The error is frustrating but rarely permanent. In 90% of cases, the fix is either re-downloading the CIA or rebuilding the title database in GodMode9. For the remaining 10%, an SD card scan or a CFW update will resolve the issue.
makerom -f cia -o output.cia -target t -rsf target.rsf -content encrypted.bin:0:0 failed to install cia file 0xd8e0806a work