Sprint is a US carrier, and moreover is one that uses a technology called "CDMA", which is used only by a couple of North American carriers and almost nobody else.
But you'll need to do a reset as part of that, so backups are going to be important this way as well.Ĭlick to expand.OK, from the software build number you quoted I think you've got a Sprint model (I Googled "HTC M9 3.41.651.4" and all of the results refer to the Sprint M9). If you have a custom ROM another approach might be to find a better ROM.
Note that returning to stock via an RUU will erase the phone, so back up everything first. Bootloader and baseband version numbers, which you should be able to read off the bootloader screen, will also be useful because an RUU cannot downgrade the firmware. Otherwise the way to find out for sure is to install an application called "fastboot" on a computer (you should be able to find it form the site or indeed many others - a web search will do this), then put the phone in fastboot or download mode (I think it's called "download" on the M9), connect to the computer via usb, open a command line/terminal on the computer, cd to the directory you installed fastboot to and try the command "fastboot getvar all" and look for the "cidnum" value. 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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