QUOTE(deadparrot)
Wrong. Softmods require a locked HD to do anything, as the original BIOS is loaded on startup, which requires the HD to be locked. Then, NKPatcher or PBL is loaded to allow you to run unsigned code.
Oh crapper soz mate completely bummed up
If you want to get your mates hdd working, it needs to be locked with a password that your xbox recognises, eg the retail hdd. If your mate can get a copy of your eeprom, then lock the drive using his eeprom, you can then transfer it into your xbox.
Once again, sorry.
Mr Abz