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Htc devices use nand/emmc write protection, preventing write access to much of the phone's internal memboery
On top of that the latest HTC phones (thunderbolt, inc2, inc3, desire s) released check for a signature on the recovery and kernel images, and throw the device into a "security warning" mode if the signatures are wrong or absent. If it is the recovery that is missing the signature, the phone will still boot but deny access to recovery. If it is the kernel, then the device won't boot.
Older HTC radios had a vulnerability that is exploitable (via scotty2's wpthis), to remove the write protection. Seems to be radios dating before January ~7th.
If such firmware exists and can be found, you guys can go the same route we did with the Thunderbolt, and replace the hboot with an ENG hboot, bypassing the signature checks.
I hack phones.
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