![]() ![]() But unless the phone's software security has been disabled (S-Off - look at the top of the bootloader screen for S-On or S-Off) you would need an RUU that's designed for the particular cidnum (Customer ID number), which means the region/carrier the phone was originally sold to. So can you tell us which of these is the case, and especially whether it has modified firmware (custom ROM or recovery)?įor returning to stock, you need a ROM Upgrade Utility (RUU), a HTC application that reflashes a phone to stock. But you also say you want to return it "to stock", which means that the firmware has been modified. ![]() If it was a carrier variant that might explain the lack of updates, as it may need to be connected to the original network to get them. Do you know exactly what M9 model it is, and what country/region/carrier it was originally sold for? ![]()
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