At the top of that you should see 3 pieces of information: "Software Status: Official", "Locked" and "S-On". If you get a black screen with coloured writing ("download mode") select "reboot to bootloader" using volume keys to navigate, power to select, and that should take you to the white one. You should get a white screen with some coloured writing. Reboot the phone and hold the "volume down" key down while it restarts (I think it's volume down, it's been a while since I fiddled with a HTC). The next simplest is to go into the bootloader. Unfortunately if it does not that does not mean that the phone is unmodified: they may have failed to achieve root, or attempted to undo it, or have "hidden" it from the root checker, or have made some other change. If it reports that the phone is rooted then that means that the software has indeed been modified. So a very simple thing would be to download a "root checker" app from the Play Store. Normally when people modify phone software it's in order to gain administrator access, which is known as "rooting". So the first thing to do is determine whether that is the case. The message is saying that the system software may have been modified, which is possible if it's a second-hand phone (you don't know what the previous owner did). Its warranty expired on march 26th of 2016". Informations about my phone from HTC support : So, this IMEI is related to an HTC One M9 manufactured to be used in USA with the carrier called T-Mobile. I already try to talk to HTC support but they cant help me anymore. If you didnt modify your system software or would like help reverting your system, please contact us via the support section at htc website". Please revert your phone to the official Htc system software to update your phone. For your protection,we cannot update your phone. We have determined that your phone may be running a modified version of its system sofware. HTC ONE M9 SOFTWARE UPDATE SCHEDULE INSTALLSo I did it but its impossible to install it, I cant see : The phone suggest me to dowload the software update number : 3.35.617.16. When I just come back to home, I wanted to check if software updates was OK but It wasnt ok. I bought a second-hand HTC One M9 in france 1year ago. HTC ONE M9 SOFTWARE UPDATE SCHEDULE ANDROIDHello, first my phone work with : Android version : 6.0 / HTC Sense version : 7.0 /
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