Each of the following are Navcore releases for the 630, not too sure if they ever released 8,302 for the 630, if they did and if I can find a link to it I will post that later for you.
8,016
8,300
8,350
8,351
I would start by installing 8,300 if that doesn't fix it try one of the others.
To install this to your device I use WinRar which you can download from
Here Switch the TomTom on and connect it to your PC, if TomTom Home starts up exit the application as Home isn't needed for this.
Double click the downloaded Navcore application file and winrar will fire up, use the mouse to select all files and folders then click "Extract To"
Please note the screen images I have used for this post are from an earlier version of TomTom Navcore, but the process is the same if installing any Navcore to the device.
Locate the drive letter associated with your TomTom and click it, make sure the Overwrite mode is selected to "Ask before overwrite", then press "OK"
When the dialogue box pops up saying "Confirm File Replace" click the "Yes To All" button.
Sit back and watch the progress bar, with a good USB2 connection a Navcore installation using WinRar will take around 2 minutes.
When its finished the update use the "Safely Remove Hardware" icon from the Task Tray and remove the lead from the device.
Let the device boot up and tap the sat strength meter (lower left) followed by the version box, the resultant screen will confirm the version installed is Navcore 8,300 - Mike