Hello,
Few days ago on xda some users successfully SOFF there phone, and slapped HTC, for there crap bootloader unlocking, I tried it and its working.
This will work on hboot 1.15 or even 1.19 latest OTA updated HBOOT.
Main there on XDA,
http://forum.xda-developers.com/showthread.php?t=1932914
Step by step guide :-
http://forum.xda-developers.com/showpost.php?p=32761598&postcount=107
Prerequirement :-
HTCDev unlock OR a temp root method.
Install TWRP 2.2.2.0 recovery.
Actually it doesnt matter you are on which rom, but you need to be on sense rom any version stock rooted or unrooted. I tried with viper rom it works.
This method needs ubuntu 12.0 or any other linux variant. 32 bit specifically. 64 bit need some packages(550mb) to run adb and fastboot.
you can grab ubuntu and install it easily inside windows, and also unistall it later.
In short how its works :-
We will intensionally brick our phone so that we can go in QC mode by flashing defected block
once its get bricked. We will flash old hboot 1.12 and then can do soff with lazy panda (as for now lazy panda only works with hboot 1.12)
please follow the step by step instructions on the above thread, If anyone got stuck, I am here to Help
Once you got hboot 1.12. you can run feedpanda.
I was on viperrom 2.0.2, feedpanda gives me success. I run it from linux. No need to go 1.13.
First, i tried from windows, but i got bricked. then i run evo4g lte unbricker.
I got sucess on linux on 2.13 hurray. I can see feedpanda need hboot 1.12 and rooted, for linux. 100% tested i tried it two times and got sucess.
I guide it not noob friendly though. But It can be achieved and there is always a risk you can bricked your ph permanently. Though its a rare case.