After Bluetooth connected to Garmin Nuvi 680, it’s able to sync and
hooks up properly. Although occasionally it works properly but often
occurs in about 15 seconds then it was disconnect. And it was occur in
almost time once users try to connecting Bluetooth to the Garmin. Some
experience in this GPS sync problem only in Blackberry 8300 Curve,
whereas it works well at Motorola and Nokia phone.

Blackberry 8300 Curve smartphone which has Bluetooth connection’s
problem to Garmin Nuvi 680 might it caused of Bluetooth software
version. In any cases, an older version works better then the newest
one. If you have the similar problem, at the first, check your
Bluetooth version, just said if your Bluetooth software version that
worst is 2.8, then you can try to downgrade to v2.4. And so, if the
worst software version is 2.40 then try to downgrade to the Bluetooth
software v2.30. To do this, you can use the Webloader software to load
the older version.