How to downgrade firmware on HTC M7
I have upgrade the firmware on my HTC One dual sim to work with Kitkat 4.4 , now i want to go back to 4.2 JB . I tried to re flash the rom with 4.2 , i am getting a message says *Mainver old fail* .
Is there any way to downgrade the rom . Details of my HTC as bellow :
Another thing how can i get S-OFF with no OS on my HTC , most of posts regarding S-OFF needs OS .
I appreciate your help