How To Install A ROM with TWRP Recovery

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Installing a ROM is a pretty straight forward and easy process. Before you install anything you should make a nandroid backup (instructions above).

-Download a ROM and appropriate Gapps package and place on your device.
-Boot into your custom recovery.
-Perform a full wipe.-Select the wipe option from the TWRP home screen.

-Select advanced wipe.

-Check the system, data, cache, and dalvik cache options.

-Swipe to wipe.

-Install the ROM.
-Select the install option from the TWRP home screen.

-Navigate to where you have the ROM zip stored on your sd card and select it.

-Swipe to install.
Most ROMs will run an installer script at this point but some ROMs have what is called an Aroma Installer which allow you to choose some install options before the script runs.

-You will also need to install the appropriate gapps package directly after installing the ROM.

-Once you've installed all necessary zips you'll have an option to wipe cache/dalvik and an option to reboot system. Wipe the cache/dalvik, hit the back button, and hit the reboot system button.