Bootton.G is a SIS file that installs a small software component that resets the device. This component will be executed automatically after installation and at system start up. That causes the reboot to fail and leaves the phone in an unusable state.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.
CAUTION! this method will remove all data on the device including calendar and phone numbers:
To prevent future infections, please download F-Secure Mobile Anti-Virus from here: https://mobile.f-secure.com
F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 44.