To take a full backup of your device in order to restore it later, you will be required to boot into TWRP recovery. Once turned off, you will need to press power key and volume up key until your phone vibrates. Doesn’t know how to do it, then follow our easy guide on how to boot Huawei phones into TWRP Recovery.
Several applications like WhatsApp and Instagram do not allow application data backups. This is a factor controlled on the developer end and you can not bypass it. Currently, there is no way to backup Android SMS by syncing them with Google. So in order to backup SMS, you have to opt for a third-party application to get the job done. I have my faith in this app called “SMS Backup & Restore”, since the last few years.
You should be able to see the current process in the “Message” box. In the “Option” section of the tool, you will see some options credit that you can select. On the main screen of the tool, you will see a number of options to choose from. Double-click on the file named “Odin3 v3.07.exe.” This is the tool you are going to be using to flash the ROM on your device. Since both of the tools – Odin and Stock ROM – are in .zip format, you will need to extract both of them. Make sure that you extract files to your desktop as it will be easier to find them later in the process.
You don’t have to understand the technical stuff like Opening Developer Options, Unlocking OEM and Unlocking the Bootloader if you are using such apps. But if you don’t want to use such apps and root the device thoroughly, you will have to unlock OEM and the Bootloader. You can take a backup of data either by transferring data to another device or by using TWRP recovery to take a complete backup. Let’s talk about the step-by-step process for Installing Custom ROM on Android without a PC or Computer. It’s a straight forward and clean guide with the core focus on helping you understand the process of installing a custom ROM on Android. Within a few seconds, you'll be greeted by Android's bootloader menu (pictured below).
ALWAYS have a working backup of your original ROM before you flash a new unknown ROM. Now, close the SP Flash tool and unplug your smartphone. The flashing process will start momentarily, and it’ll get accomplished in a minute or two. Now click on the Download button to start the flashing process.