Huawei Mate 20 downgrade firmware is now available on the Ministry of Solutions. This firmware is available for free. If you are looking to downgrade your phone to the older security patch level this firmware could be helpful for you. Only advanced users can use this firmware, because one wrong flash can make your phone completely dead. Firmware can be installed by official method or 3rd party tools can be used.

Firmware Details:

• Android Version: 9.0
• EMUI Version: 9.0
• Build Number:HMA-AL00B 9.0.0.157(C00E156R1P21)
• Supported Model: HMA-AL00(Chinese)
• Update Type: Official Stock Firmware
• Download Link: Click Here
• Password:” ministryofsolutions.com HMA-AL00 “
• Tip: use internet download manager for faster speed

Installation Guide

• Backup all important data from the phone
• Charge the battery up to 50%
• Get a USB OTG with 8GB of free space
• Extract the downloaded firmware zip file
• Then copy the dload folder to your USB
• Connect USB with phone
• Then power off the phone and disconnect from pc. Hold volume up, volume down, and power, keep holding until the update starts.
• If it does not work use any 3rd party tool to flash your phone

Note: Everything you do at your responsibility, this guide is provided for free without any guarantee.