Downgrade Huawei P8 (UL00) Marshmallow to Lollipop Firmware [Tutorial]

You can restore your Huawei P8 back to Lollipop OS from Marshmallow using the official B300 transition firmware package provided by Huawei for Europe.

Transition Firmware Details

• Device: Huawei P8
• Model: GRA-UL00
• Android: v6.0 Marshmallow > v5.0 Lollipop
• Build: GRA-UL00C900B300
• Status: Official
• Type: Transition Package
• Release Date: 8.02.2016
• Region: Europe
• Country: Russia
• File Name: RollbackMiddlePackage_GRA-UL00C900B300_Android 6.0 to Android 5.1.zip

Download Link: Official Mirror | Size: 399.44 MB

How to Downgrade

This downgrade package is only intended for the European GRA-UL00 variant of Huawei P8.

1. Unzip the transition package on your computer.
2. Transfer the dload folder to the external microSD card.
3. Safely disconnect the USB cable from the PC.
4. Dial *#*#2846579#*#* to open Project Menu.
5. In the menu, go to Software Upgrade > SDCard Upgrade > ‘OK’.
6. Once the device reboots after installing the transition firmware, make sure the Build number says ‘GRA-UL00C900B300’.
7. Now you can install whatever Lollipop build (for the UL00 variant, of course) you want – like B132 using the exact same procedure.

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