stuck trying to go back to stock

Hi all,



i was s-off and unlocked and need to go back to stock.



I flashed RUU Zip M7_UL_JB_50_HTC_Europe_1.20.401.1_Radio_4A.13.3227 .06_10.27.1127.01_release_308001_signed_2_4.zip from fastboot,

then installed TWRP and rooted, then used revone to lock boot loader, and then i did

fastboot oem writesecureflag 3

to s-on.



at this point i expected to be able to use an RUU exe to clear up the recovery and then do OTA updates.



But, the RUU fails each time with an unknown error.





So i have rooted again and attempted to s-off again with revone, but revone fails with error -1.

My boot loader screen now shows TAMPERED and UNLOCKED, and i have boot 1.43

Im not sure how to proceed. I've now got an old rom, s-on and am unable to update to anything newer.



Anyone have any ideas please?



thanks

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