T-Mobile Sidekick 4G hard reset

If the phone is not working correctly, you may need to reset it. While a hard reset deletes all your information, you can clear the system cache to restore most factory settings without losing your applications, Gmail, or other information. To clear the system cache to reset the phone, follow these steps:

Save any open files, and back up all necessary data on theinternal memory if the device is responsive and can synchronize files.
Turn off the phone.
Note: If the phone is unresponsive and does not turn off, remove the battery and then re-insert it.
Hold down the Volume Up + Volume Down keys and Power key simultaneously.
Release the keys when the Samsung logo appears on the screen.
Press the Volume Down key to select Delete all user data when the Android master reset menu appears.
Press the Power key to confirm your selection.
Press the Volume Down key to select Yes – delete all user data.
Press the Power key to confirm your selection.
Press the Power key to select reboot system now.

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.