It's been awhile since I've had a chance to get back to xda, so when I saw the htc dev bootloader unlock method, I jumped at the chance to unlock my version 1.5 bootloader and be able to get root without downgrading. However, just a few days later, the Ics ota was released. I had
1. unlocked my bootloader VIA HTC dev method,
2. Flashed twrp from command prompt, and
3. Flashed Su from twrp.
In a nutshell, I had root but was on a stock 2.17 ruu (latest gingerbread ruu) and had root. In order to try to revert to stock, I used the command "fastboot oem lock" to relock my EVO (cdma) so i could ota update, because when i tried to with root, I simply was booted into twrp.
So, after locking (and also removing the recovery.img from my sdcard) my bootloader, I tried to ota, which only put me into my bootloader with a message under "relocked"(at the top of the screen in bootloader) which said "security warning". I've tried to run the 2.17 ruu when in fastboot (because it would only give me security warning otherwise) but there was pretty much no visible effect on my phone. The ruu said it ran successfully, but after booting up I still had Su, and none of my app data had been deleted. I also couldn't do a factory reset from the OS or from bootloader. If anybody could help me get to ics anything, or at least back to stock w/o root (,so i can apply the ota and go from there) it would be greatly appreciated.
As a sidenote, I haven't used the ruu.zip method (PG86IMG.ZIP).