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Root your Android based device – a custom ROM can be flashed only if it can access, modify, optimize or remove in built settings, features and processes; thus, ensuring root is a must. Install a custom recovery image, like CWM or TWRP recovery on your One M7 – as already mentioned, through the recovery environment you can make a Nandroid backup; moreover, the actual flashing process can be completed through the same software. Make sure you can use a computer, your smartphone and its USB cable – a connecting between these devices will have to be enabled. On your computer you will have to download the CM 13 firmware file and compatible Google Apps. It will be a good decision to turn off security features before doing so – antivirus programs might interfere with the download process.
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If you want to make things work, on your phone you must gain Developer Options, from where you should then check the USB Debugging option. For Developer Options: go to “menu – settings – about phone” and tap several times on Built Number; then, access “menu – settings – developer options” and check the USB Debugging field.
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Those were the essential pre requisites. However, you shouldn’t go any further without making a general backup too. You see, a custom ROM can be safely flashed only if you first wipe the system of your device (make a hard reset and clear app data cache).
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Therefore, in the end you can end up in losing everything that’s saved on your phone’s internal storage memory. Basically, that’s the reason why you should now backup your contacts, call logs, texts, images, videos, audio files, market apps, internet settings, IMEI / NVRAM and so on.Finally, a good call will be to check the battery life on your HTC One M7 – if your phone will get turned off while you try to install the CM 13 Android 6.0 Marshmallow firmware, software related problems might be issued.
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So, you should plug in the charger if the power left is currently lower than 50%.Don’t forget that this tutorial is compatible only with the International, T-Mobile and AT T models of HTC One M7 – try not to mess things up by using the steps from below on a different Android based device.Go to this page and download the CM 13 custom ROM file; then get Google Apps package from here. Place these files on your computer; on desktop if possible.
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Plug in the USB cord and through the same connect your smartphone with your computer. Now, get the downloaded files and place them on your device.
After doing so, unplug the USB cord and power off your smartphone. Reboot recovery mode on your HTC One M7. From recovery apply the classic wipe: “wipe data factory reset”, “wipe cache partition” and “wipe dalvik cache”.
After erasing and clearing the system, load the update file by choosing “Install”. So, pick the CM13 ROM and install Android 6.0 Marshmallow on your One M7. Repeat the last step and flash Google Apps package.
In the end, reboot to Android OS by selecting “reboot” from main menu of recovery.Congratulations; you can now safely test the new Android 6.0 Marshmallow firmware on your own HTC One M7. Remember that the present build of CM 13 isn’t yet stable enough for a daily use, but it should be soon as the devs are hardly working in resolving all the bugs.