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11-08-2013 17:58 - edited 11-08-2013 18:08
Sorry..but the Resets you are trying do not work on S40 phone like yours ...
You may try un-installing whatever applications (no longer needed or rarely used) that you can .. If possible, Format the Memory Card and start afresh. Store minimum no. of Messages on the phone. If you need to keep them Sync / Back-up on PC using the Nokia Suite
Are these themes pre-loaded or downloaded by you ? If downloaded, You may try un-installing them using the Nokia PC Suite. Once you install the PC Suite on the PC..connect the device and open the PC Suite and select Install Applications. Select the 'theme' in the Right Hand side window and 'Delete' (Bin Icon at the top) .. Then re-download and check.
If problem remains.. you may try a Factory reset (Menu-->Settings--> Restore factory settings..) after backing-up your data..