I have followed through all of the notes in this forum with no luck. - After a little while playing and a few stabs in the dark I have it working.
If you can turn off Bluetooth, then open isync and see the V800, this should get it to sync.
Firstly, all files that we edit you should BACKUP just to be safe.
Secondly, I assume you have followed the previous instructions a
Close isync, open the following file in text edit /Library/Application Support/SyncService/501/BTConduitDefaults.plist
NOTE : I have a folder called 501 this may not be the case on you machine, look in the folders that you have until you find the file.
Towards the bottom of this file I had the following :
<dict>
<key>kBTConduitIRMCChannelIDKey</key>
<integer>8</integer>
<key>kNSSyncDeviceID</key>
<string>00-0f-de-93-34-d5</string>
<key>kNSSyncDeviceShouldSlowSyncCalendars</key>
<true/>
<key>kNSSyncDeviceShouldSlowSyncContacts</key>
<true/>
<key>kNSSyncDeviceUseCalendars</key>
<true/>
<key>kNSSyncDeviceUseContacts</key>
<true/>
</dict>
What I did was to copy this section in to another text edit document, then replace it with the following, the bits in bold are what I have edited, with the kNSSyncDeviceID string being taken from the text we copied into the new text edit documents
<dict>
<key>kBTConduitIRMCChannelIDKey</key>
<integer>8</integer>
<key>kBTConduitModelKey</key>
<string>V800</string>
<key>kBTEmptyFolderIsOkayReally</key>
<true/>
<key>kBTFilteringDestinationFolderName</key>
<string>Untitled</string>
<key>kNSSyncConduitFilteringContactGroupMap</key>
<dict>
<key>A928BEA8-F9A9-11D8-92ED-000A95D87870:ABGroup</key>
<dict>
<key>kNSSyncConduitFilteringContactGroupName</key>
<string>Group Name</string>
</dict>
</dict>
<key>kNSSyncDeviceID</key>
<string>00-0f-de-93-34-d5</string>
<key>kNSSyncDeviceName</key>
<string>V800</string>
<key>kNSSyncDeviceShouldSlowSyncCalendars</key>
<true/>
<key>kNSSyncDeviceShouldSlowSyncContacts</key>
<true/>
<key>kNSSyncDeviceUseCalendars</key>
<false/>
<key>kNSSyncDeviceUseContacts</key>
<true/>
</dict>
So just to recap, edit the file in /Library/Application Support/SyncService/501/BTConduitDefaults.plist
Copy off the last part as shown above. Then add the second part above using the device id from the old part of the file. Save document, open up isync and cross your fingers.
Hope this is of help, sorry if it doesn't make sense.