Flashing the Custom ROM

The preferred way to flash a ROM is to do it manually through your custom recovery. Make sure you’ve got your recovery tool setup, then switch off the cellphone and boot it into recovery. The way in which you do that differs on every phone, however, normally involves holding down a combination of the power button and the volume buttons, then following any on-screen commands.

Flash the ROM

Once the recovery tool has been launched (in this case, TWRP), you can begin flashing the ROM. Here are the steps:

Step 1: Create an Android backup. This is what you will use to restore your cellphone to its previous state or to recover from any errors. Go to Backup and pick out which partitions you need to save. You can include them all because it’s possible to select which part to restore when the time comes.

Step 2: Swipe the bar to get started, then wait several minutes for the backup procedure to complete.

Step 3: Go back to the home display screen and choose Wipe. Swipe the bar to reset your smartphone (it might not wipe your internal storage). This step is optional; however, not wiping your smartphone may also cause errors with your ROM (that is known as a dirty flash).

Step 4: Return to TWRP home screen and select Install. Navigate your way to where you stored the ROM (the zip file).

Step 5: Select the zip file, then swipe the bar to begin installing. The process might also take a couple of minutes.

Step 6: After it completes, repeat step 5 with the Google Apps zip if you need to.

Step 7: Now reboot your cell phone.

Don’t panic if it appears to freeze on the boot screen because the first boot after flashing a ROM generally takes a little longer than regular. Having taken a android backup, you should always be able to restore it to get your phone up and running quickly.

Once your cellphone has restarted, you’ll need to restore your files and apps (assuming you probably did wipe the data as mentioned above) and log in to all your services again. Most ROMs are pre-rooted, so if you used Titanium Backup, it’s going to work with no extra steps. Now you can enjoy your new software.

Sometimes, you may want to switch back to the original operating system (stock ROM) that came with your Android device. This could be because you’re experiencing bugs or performance issues with the custom ROM, or you simply prefer the stock experience. This might push you to uninstall custom ROM on Android phone.

Before You Begin

• Back up your data: This is very important, as uninstalling a custom ROM will erase all your data and settings.
• Download the stock ROM firmware: This file can usually be found on the manufacturer’s website or dedicated Android firmware repositories.