Hard Reset for Siemens ST55

In order to hard reset a Siemens ST55, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Siemens ST55 device will be brought back to the default configuration of a brand new device.


1. Press & hold the Power button until the phone turns on.
Hard Reset for Siemens ST55
2. Enter your secret code, *#9999#.

3. Wait until the phone resets and restarts. Complete.

Warning ! HardReset24.com is not responsible for any damage caused by our tutorials. You do it at your own risk.

Our website collects data, uses cookies to work properly as well as to personalize ads and measurements. Check what it means for you Google Privacy & Terms.