Recently, I got an error message on my P800 duing startup. "Disk Full". After that, I can't do anything except switch-off. I went through some website to do the Master Reset. However, I can't access into the secret menu because I can only access the option page which is "Phone on, Flight Mode or Power off". I went to Sony Ericsson Shop and they stated that the flash memory was bad. Then I have to pay extra US$340 for repair. Any recommendation? Please advice, thanks.

Help... please help...!!

Thanks in advance.