One final question, do we have to unlock the ENG S-OFF 1.90.2005 before applying the RUU update? I gave it a try with it locked and it was a no-go?
The instructions pasted in here say specifically to have ENG boot loader. You may also be just htc unlocked but you will need to flash a stock recovery, and keep in mind if you upgrade to ICS with S-on you may not be able to get it afterwards. You still will be able to retain root however.
If you are referring to the phone saying "locked" but with ENG boot loader installed you are fine. It should work with no issues.
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