[Q]Can't downgrade via RUU
My device is M7_U , TAIWAN version,
S-OFF, and unlock, CID is HTC__621
and i have a RUU exe file with version 1.20.709.101.
I'm try to downgrage to 1.20 after OTA and always successed before rom version 3.63. like
OTA to 2.24, and downgrage to 1.20 -> work fine.
OTA to 3.18, and downgrage to 1.20 -> work fine.
but currently, I just OTA to 3.63 and trying to downgrade back to 1.20.
RUU always show error image and stop.
is firmware 3.63 doing something different then before version ?
I checked the firmware 3.63 content, there is one file added "tp_HMX852XD.img"
what is this file working ? is it make my device can't downgrade to before version ?