Installing RUU as a way of downgrading hboot?
Because my HTC Evo 3D is gone for repairs it will (hopefuly) return fixed and most probably updated to stock ICS with hboot 1.53.0007. Previously I've used HTCdev to unlock the bootloader and install 4ext recovery, then the Wire Trick
to get S-off and finally this guide
to downgrade to hboot 1.49.0007
Before sending the mobile for repairs, I've reverted it as close to stock as possible, using the method described here
. One of the steps required extracting ROM.zip from RUU exe file, renaming it to PG86IMG.zip and installing in fastboot.
Now my question is... With a "fresh" phone (ICS, S-on, locked), will it be possible to install PG86IMG.zip extracted from Gingerbread RUU in fastboot? If this way works, it would downgrade hboot to 1.49.0007 and then allow me to use Revolutionary
to get the phone Unlocked and S-off (instead of the HTCDev + Juopunutbear + hboot downgrade combination).
Will this work or will it fail? If the latter, is there a chance of bricking the device?
I'm sorry if my question is noobish, but I'm still very new to all the HTC hboot, S-on/S-off and fastboot stuff...