1st of all
FORGET about clockwork and boot strap or any of that garbage
This update works via factory update from the sd card.
Flash the phone back to stock with RSD. You do know we have those files now right? Takes only a few mins and your phone is just like it was the day you opened the box with the exception that all your presets and account(s) info will still be there, (unless you did a hard reset) but in any event it will cure all your ills and then you can update.
You can always flash back to stock and never miss a regular OTA update, with exception to the locked bootloader our phones are now an open playground, I would think a ROM developer would know these things but and I digress I don't know jack crap about ROMS yet I know all about how to flash these updates, so go figure huh?
More info here:
Installing 6.12.173.xt912 - DroidRzr.com