In order to hard reset a Toshiba G900, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Toshiba G900 device will be brought back to the default configuration of a brand new device.

1. Power up the device.

2. Enter this code into the phone: *#9999#. Confirm.
3. Enter the password. Default password is 0000. Confirm.
4. Well done, the hard reset process is now complete.