Original post by: Виктор Бордюжа ,
3.1 Download Android5.0 version upgrade package http://download-c.huawei.com/download/downloadCenter?downloadId=81666&version=324152&siteCode=ru Copy the file named “UPDATE.APP” of Android 5.0 version to the folder named “dload”, and the folder should be in the root directory. Notes:delete the UPDATE.APP of the 1st update before this step. 3.2 Confirm upgrade package Go into “File Manager”, then Local->SD card->dload, make sure UPDATE.APP is under dload directory. 3.3 Rollback operation (same as chapter 2.3) Follow this step to upgrade, power off, and then press the button volume+, volume-,and power at the same time.