Originally Posted by glevitan
Well you are definitely wrong. All versions are rootable. Ruu stands for remote update utility and it is the stock firmware of the device.
You cannot flash a ruu in recovery but have to do it in fastboot. From there you can unlock the bootloader and root.
Sent from my Nexus 7 using xda app-developers app
I think I might've completely screwed up what I was trying to say or you may have misunderstood what I was saying. So I'm just going to refer back to what I was trying to explain in context of an older HTC device (Wildfire, in this case).
In some scenarios with the Wildfire, we were able to run an RUU and successfully roll back to a stock rom whilst retaining a S-OFF bootloader (Meaning the ability to use fastboot to flash a recovery and root using a su zip was possible). I think I was trying to say this may be possible/may occur with the DHD. Meaning that OP would just have to use fastboot to flash a recovery and an appropriate superuser zip to get root, and therefore any version would be rootable (even if he rolled back). However at this point I'm not sure if the DHD RUU's overwrite the hboot/bootloader. (I've never really felt like flashing one and I don't feel like getting another sim unlock code at this point)
HTC Desire HD
Android 4.0.4 - Sense 4.1 - SVHD 1.3.0
Bootloader unlock with htcdev
- Motorola Motoluxe XT615 (Still in my possession)
- HTC Wildfire (Selling/Trading it in soon).