I am having trouble returning my T-mobile HTC One M7 phone back to stock. I already relocked the bootloader. I tried to flash a the RUU which I feel like is not working because the signature keep coming out failed. It could be the wrong RUU. Can any one help me find the RUU version 1.27.531.7 for my phone. I have tried every where and I am getting the wrong RUU or the RUU is not working. Because as of right now my phone is useless.