Huawei GR5 2017 (BLL-L21) Stock Firmware

Build: BLL-L21C185B376
Size: 1.62GB
Type: FullOTA-MF
dl times: 39915

This update improves system security with Google security patches. Integrates Google security patches released in Mar 2018 for improved system security. 1. This update will not erase your personal data, but we recommend that you back up any important data before updating. 2. If you experience any issues during the update, please call the Huawei customer service hotline in the warranty card or visit an authorized Huawei service center for assistance.

Full Guide on How to Install Stock Firmware on Huawei GR5 2017 BLL-L21

Pre-Requisite :

This Guide is only for Huawei users.

You need MicroSD Card or internal memory space to try any Huawei Stock ROM

A Micro SD card of 8GB or more should be available. It is recommended that The Micro SD card is made by ADATA, Silicon Power, Hp, Sandisk, Kingstone, or Kingmax.

Make sure you have enough battery to run the upgrade process. It is recommended that the power of the battery is more than 40%.

Upgrade operations may erase all your user data. So if there is some important information, you should backup them before the upgrade.

Before flashing, you should unzip the SDupdate_Package.tar.gzfile, and get out UPDATE.APP to do upgrade operation on your SD Card. To unzip, we may sometime share two zip file, Update.zip package always comes with the main update.app which is a complete OS. Where has data file comes with data files from Huawei? Check the below file list.

First of all, Download the Update Package
Recommended: Format the Micro SD card (This operation is optional).
Now Unzip the Update.zip package and
Copy the entire dload folder (with UPDATE.APP in it) to the root directory of the Micro SD card.
Now on your phone, Open the dialer and call ->enter: *#*#2846579#*#* ->ProjectMenu->Software Upgrade->SDCard Upgrade->OK,
Now select the Update.app that you moved to SD Card (root directory).
Now you will see a screen which shows the installation process.
Wait until the installation process completes.
When the progress bar stop, the phone will restart automatically
In case if you have the Data File and you want to flash it, then, first of all, delete the earlier moved update.app from the dload folder
then you can extract the second file (update_data_Xxxxx) from above and move the new update.app to the dload folder.
repeat the same 4-8 Steps above.
That's it! You have Installed Stock Firmware on Huawei Smartphone.