HTC One – Information about modifications
As all previous HTC devices new M7 will have some modifications which are related to different markets and here some information about them.
M7_U – Networks: UMTS/GSM MID: PN0711000 Device ID:HTC 801e – Region: EUROPE/ASIA
M7_UL – Networks: UMTS/GSM/LTE MID: PN0710000 Device ID:HTC 801n – Region: EUROPE
M7_WLS – Networks: WCDMA/CDMA/LTE MID: PN0720000 – Region: Sprint USA
M7_WLJ – Networks: WCDMA/CDMA/LTE MID: PN0740000 – Region: KDDI Japan
M7_DTU (Canceled MID PN0760000) -> M7C_DTU – Networks: Dual Sim TD-SCDMA/UMTS MID: PN0780000 Device ID: HTC 802t – Region: China Mobile
M7_DUG (Cancelled MID PN0770000) -> M7C_DUG – Networks: Dual Sim UMTS/GSM MID: PN0771000 Device ID: HTC 802w – Region: China Unicom
M7_DCG – (Canceled MID PN0750000) -> M7C_DWG – Networks: Dual Sim WCDMA/GSM MID: PN0751000 Device ID: HTC 802d – Region: China Telecom
I can confirm that M7_U ROM cannot be used on M7_UL device without some adjustments, while M7_UL ROM can be used on M7_U device.