Step 3. Once in TWRP recovery, choose “Wipe”.
*Note – You can also “dirty flash” without wiping. This is recommended for installing stock ROMs if you are installing stock ROM on top of another stock ROM. If that’s the case, skip this step.
Choose “Advanced Wipe”.
Select Dalvik Cache, System, Data and Cache then swipe to wipe. By wiping the system partition here, we will make sure our file structure is perfectly clean before installing a new ROM.
Step 4. Choose “Install” from main menu.
Choose the storage you have your ROM zip files in. Here you can choose internal storage, micro SDcard, or USB storage (if using OTG USB Flash).
Browse your file system and find the ROM zip file. In this example, I am installing CM12 ROM so I will be choosing the ROM zip file below beginning with “cm-12”.
Swipe to install ROM.
If you are installing an AOSP ROM like CM12 like I am doing here, repeat this step and also install the Gapps zip file. Otherwise go to next step.
Step 5. Reboot and you should see your new ROM boot up.
Step 6. If you get to the Welcome screen or your phone boots, congratulations! You have successfully installed a new custom ROM onto your Android smartphone/tablet!
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