You have two basic options when building a new disk with xboxhdm:
- use Frosty's Rescue disc to get your real C and use that and your current E to build xboxhdm, giving you an identical copy of your original softmod
- take the stock C files from Slayers / CASH, build a new Kingroach softmod top on of the stock C, then use the resulting Kingroach files to build xboxhdm, giving you a new, clean softmod. This is the best option if you aren't sure which softmod you used, or if you want to upgrade your softmod.
As you've discovered, the first one works fine, but you've only half done the second option - you used the stock C but without building the Kingroach files on top.
So, unlocking the drives and rebuilding as you describe will work fine, and you'll end up with an identical copy of your original softmod. You don't need to boot twice - you should be able to lock the hard disk with your original xboxhdm disc.
Not sure what the "invalid selection" error means - but try building a new xboxhdm boot disc, see if that fixes the problem.
This post has been edited by Heimdall: Feb 17 2009, 05:20 AM