I have a go510 which is now 6/7 years old and has served me very well...I decided to upgrade my Great Britain maps yesterday BUT, stupidly I did not back up my device..when I attempted to turn it back on ALAS I found no maps were available...OOOPS,,,..and try as I might I could find no solution to recovering my basic great britain maps....Then I recalled that my daughter also had a slightly okder version of the 510...so I used her unit and backed the info onto the computer...haha now Im using my head..or so I think.....my thinking was that If I now restore the backed up files onto My own unit all will be ok,and I will have got back to where I was a short while ago...I have the product code and the activation code ..but when I enter the activation code,,,My unit tells me that this is the wrong code OH DEAR ..Please please can someome tell me what I have done wrong ..apart from not backing up in the first pace and what to do and give me some advice as to how I can just return my basic Great Britain route maps,.,,Thats all I need Help,,Many thanks