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.!
Samsung Trender M380 hard reset
Use this method to hard reset your Samsung Trender phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.
Resetting Your Phone
Resetting the phone restores all of the factory defaults,
including the ringer types and display settings and
deletes all content stored on the phone.
1. Press HOME key and touch Main > Settings > Reset > Reset Phone. (A disclaimer is displayed.)
2. Read the disclaimer, write down the lock code, and touch Proceed.
3. Enter the lock code provided on the disclaimer by using the onscreen keypad.
4. Touch Done to restore your phone to its factory default state.