Block bootloader. http://www.htcdev.com/bootloader
Video tutorial: http://www.youtube.com/watch?v=33UDfztt2No
Install the ROM RUU M7 UL JB43 SENSE50 MR Cingular U.S. 3.17.502.3 Radio 4A.19.3263.13 10.38j.1157.04 Release 334235 Signed 2.exe
Download: http://www.htc1guru.com/dld/ruu_m7_...3_10-38j-1157-04_release_334235_signed_2-exe/
Video tutorial: http://www.youtube.com/watch?v=rpA71FXddyU
more information: http://xdaforums.com/showpost.php?p=50791646&nocache=1&z=3079356166999787
Video tutorial: http://www.youtube.com/watch?v=33UDfztt2No
Install the ROM RUU M7 UL JB43 SENSE50 MR Cingular U.S. 3.17.502.3 Radio 4A.19.3263.13 10.38j.1157.04 Release 334235 Signed 2.exe
Download: http://www.htc1guru.com/dld/ruu_m7_...3_10-38j-1157-04_release_334235_signed_2-exe/
Video tutorial: http://www.youtube.com/watch?v=rpA71FXddyU
more information: http://xdaforums.com/showpost.php?p=50791646&nocache=1&z=3079356166999787
Did the method work? I converted my AT&T HTC One to developer edition and upgraded it to Android 4.4.2 with Sense 6.0 with bootloader locked and S-OFF. Consequently, mu HBOOT was 1.57 and when I tried to flash the 4.3 RUU, it didn't work and showed error 155 or something like that. What I had to do for solving this was to flash HBOOT 1.55 (same as 4.3 RUU) and then run the 4.3 RUU. It succeeded after that.
Thanks for putting this into a guide! It is well written and easy to follow. I was finally able to return to stock following your instructions after getting on Sense 6 but needing to return the phone for warranty services.
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