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Android devices are fun to use, but they're not always the easiest to set up. If you're fed up with sifting through documentation and trial-and-error-ing your way through yours, this article will show you how to install a custom ROM that makes your life easier. Plus, doing this has a side effect of getting your device running on pure stock Android 7.1.2 instead of any custom ROMs you might have installed before! You'll first need a computer and an empty SD card or USB drive at least 2GB in size for installing the Android system image onto the first card/drive -- these can be found from anywhere online as long as they're from reputable sources. You'll also need a phone to use for this. Ordinarily, you would need to root your phone in order to install a custom ROM, but because the files in the Android system image are already rooted, you don't have to do anything extra here. If you're using a device besides an Android phone or tablet, please follow the instructions from the original post for your device . If you're trying one of these guides on a Windows PC, know that you'll have to download and install a special program -- Fastboot -- from Google before proceeding. Fastboot is kind of similar to adb , except it lets phones communicate with PCs over USB even though they're not physically plugged in. First, download the system image. You'll need to extract the system image file from this .zip archive once you have it downloaded. Copy the contents of that archive into a folder on your computer, then open a terminal window and type cd into that folder. Press enter to enter an "active directory" from the directory's contents, then press tab to select all files and press enter again to have those files copied into their current active folder. When you're finished with this step, your new system image folder will look something like this: Before installing a custom ROM on your phone, you should backup your data first so if something goes wrong you can restore everything back. Next, you'll need to boot into Fastboot mode. Depending on your phone, this will usually be one of the following keys: Since this phone doesn't have a removable battery, it has an SD card slot instead. Using an adapter cable, I took the card out of the phone and put it into my computer just for a bit to see what would happen. Now that my computer can see what files are on my SD card, I can copy them over to a blank SD card or USB drive that I have that's twice as large as my original. Use the file manager app on your computer to copy the system image file over to that new SD card or USB drive. The .zip archive file will get unpacked automatically, and the contents of that archive will get copied over. When your new system image is finished copying, remove your device's SD card or USB drive, then reboot into Fastboot mode again to test it -- it should work perfectly fine! (Credit: @mikecova) WARNING: DO NOT continue this process until you've backed up all of your data (including SMS/MMS, contacts, call logs, text messages , apps/games/etc., music , videos , photos , etc. cfa1e77820
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