Some users didn't liked the new Marshmallow firmware and they want to downgrade or roll back to lollipop. its a very easy process if done in proper way. 1st of all you have to determine you belong to which region, Dial *#*#2846579#*#* and then tap on network information and then tap on vendor info. if it shows "meafnaf" its middle eastern . if "spcseas" then your phone is asian, and if "eu" then phone is european variant. and you should download file which belongs to your region.Huawei Mate7 downgrade to lollipopThis guide will not work for B571Steps:1. Take complete backup of your data2. If your phone is rooted, unroot it completely. (how to unroot?)3. You must have stock recovery4. Battery charged at least 60%5. Download rollback packageRollback package for MT7-L09Rollback Package for MT7-TL106. After download extract zip file and copy "update.app" file in "dload" folder in your phone memory/sd card.7. Switch off phone, (remove cable if using PC) and hold 3 buttons ( volume up, volume down, & power button) until update starts.8. Once Update finish confirm in settings>about phone . build number is showing C900B500.9. Now download your desired version of lollipop & install it same way as you installed rollback package.
