icn330 menu system

Whilst holding in differant buttons whilst switching on i hit upon this.......Hold in the big button in middle of d pad and switch on then you get into maintenance menu: 1/ self test cycle. 2/ gps menu. 3 display firmware information. 4/ utility menu. number 1 is self explanitory so on to 2 then options are..gps info, perform a gps cold start, perform a gps factory reset, show gps receiver firmware version, show gps reciever serial number, gps diagnostic tests, gps ttff tests.............under utility menu you have these options file system tests menu, lcd/keyboard menu, sounds menu, other menu,so file system filesystem performance tests, write a test file on b, B incrmental chunksize test, get the r/w status of card in slot 1, set the r/w ststus of card in slot 1 to fastest, perform checkdisk on drive b...nlots of other sub menus so has any one any idea as to what they do or if they are of any use.....