Prior to installing any custom firmware or ROM

making a full system backup is absolutely essential

It’s a full snapshot of your phone’s current state including apps, media, and configurations

If something goes wrong during the flashing process—like a failed flash, a bricked device, or unexpected bugs

your device can be returned to its pre-flashed condition with this restore point

This saves you time, data, and potentially the cost of repairs or replacements

First, make sure your battery level is at 100% or at minimum 70%

A low battery during the backup process can lead to corruption or failure

Go to Developer Options and toggle on USB Debugging and OEM Unlocking

You’ll usually find them by navigating to Settings > About Phone and tapping the Build Number 7 times

Use a high-quality, original USB cable to ensure stable communication

Make sure your computer has the proper drivers installed for your device

Now restart your phone into recovery mode

The method to enter recovery mode varies by manufacturer but usually involves holding a combination of buttons like power plus volume up or down while the device is turned off

If you’re using a custom recovery like TWRP, you’ll see a menu with options like backup, wipe, and اکتیو باکس install

Tap on "Backup" from the main recovery menu

You’ll be prompted to select which system areas to include in the backup

Essential partitions: system, data, boot, and recovery must be selected

Don’t forget vendor if it appears in the list—it holds critical firmware components

Even if you’re unfamiliar with dtbo or persist, include them to ensure a complete backup

Timing varies—larger storage or slower chips may require longer

Avoid unplugging, rebooting, or touching the device during backup

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It’s a good idea to copy this entire folder to your computer for safekeeping

In case your phone won’t power on, you can recover your data from a computer

Proceed with flashing only after confirming your backup is complete and copied

Always verify the integrity of the file you’re flashing by checking its checksum against the one provided by the developer

Installing a damaged, modified, or mismatched ROM is a leading cause of boot loops

Don’t delete the backup immediately—even a successful flash can reveal hidden issues later

You may miss your previous UI, lose app functionality, or encounter buggy third-party apps

Your memories, chats, media, and preferences remain intact when you roll back

This one precaution avoids countless hours of stress and repair work

You probably already have everything needed: drivers, cable, and recovery installed

Never skip this step, no matter how confident you feel about the flash you’re about to perform

Your data is precious, and a backup is your safety net