Right, but you were rooted or were on the original vers. The problem with the RUU's is that they wont work on a newer Hboot, which we cant change unless we are rooted.
So yes, if you are rooted or have never applied any OTA's, then you can flash the ENG Hboot, and do whatever you want.
If you installed the latest OTA, and your are not rooted. You wont be able to flash the ENG Hboot. And you wont be able to use a RUU to downgrade.
thats not true...
I did do the OTA and thats why i flashed the Eng boot version of pc36
Thats why it was such a PITA to fix... I learned my lesson the hard way but lesson learned...
Now im Forging ahead with the rest of you...