668 upgrade

Just purchased a used RS 668 digital iscan from a retired police officer. As I am unfamiliar with all the new technology, the retired officer has upgraded this unit to the latest available upgrades such as whistler 1080 and dmr. I have no clue what all this means. It came with upgraded belt...

Had my 668 Updated to the Ws1080 through whistler. Worked fine for a week or so and now my menu button does not work. Anyone else had this problem or is it just me. I did a reformat and it still does not work. Any help would be appreciated.