Huawei Ascend Mate hard reset

You can go into the recovery screen using phone keys.
Turn off your Ascend Mate phone and press the volume up key and the Power key until the phone start screen appears. Do NOT press the power so long otherwise, or the phone will power off.
huawei ascend mate hard reset

from menu
To restore factory settings, touch Settings > Backup & reset > Factory data reset > Reset phone

Huawei Ascend Mate force firmware upgrade mode

1. First charge your phone. Back up all of your data, because firmware update will reset your phone to factory default state and delete all of your data.
2. Download Huawei Mate latest firmware from official website.
3. Extract the file on your computer. Copy dload folder with file to the root directory on your sd memory card.
4. Power off your Ascend Mate Android phone. Insert the MICRO SD card into the memorycard slot. Pressing both the VOLUME UP and VOLUME DOWN key, then press the POWER key to power on your phone, and VOLUME UP key and VOLUME DOWN key should be pressed more than 3 seconds, then it will enter the Software Upgrade Mode.

5. Alternate mode to upgrade your Huawei Ascend Mate firmware is from the menu, by go to Settings->Storage->Software Upgrade->SD card Upgrade->Confirm->Upgrade.

Do not forget to check the build number by go to Settings ->About phone->Build number.

Ascend Mate Factory reset using menu when phone and screen is responding

Android 4.1.2

If your phone is responding to screen input, then open Settings from the Applications menu. Tap Backup & reset > Factory data reset, click Reset phone and then Erase everything to format your phone.
1. On the Settings screen, touch Backup & reset > Factory data reset.
2. Touch Reset phone according to the onscreen instructions. Touch Erase everything . The phone is reset to its factory settings, and then restarts

Or on older firmware 2.x

1. From the Home screen, press the Menu Key and touch Settings.
2 Touch the Privacy
4 Touch Factory data reset.
5 Touch Reset phone.
6 Touch Erase everything.

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.