by Hard Reset
Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before 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.!
ZTE Racer X850 Smart Touch T3020 hard reset
When your phone is locked tap Emergency call and use dialpad key in *983*987#. Perform a factory reset. All data will be lost!
Hard reset possible with flasing a new ROM img
When your phone frozen, pull the battery up and remove it from the mobile phone, reinsert it, then turn ON your phone.
Reset to Factory Settings
1. Tap MENU icon > Settings > Privacy.
2. Tap Factory data reset.
3. Tap Reset phone.
ZTE X850 Racer Smart Touch T3020 hard reset using buttons
Try this. Press and hold VOLUME UP + POWER ON device. This is ftm recovery mode, you need android ZTE driver for pc eg. win 7, XP etc. and ZTE Racer ROM img file.
You need to reinstall image firmware then you can do recovery via recovery menu wipe data / factory reset ZTE Racer. You can find img and driver files on the web.
Reset Unlock pattern