he 6288 is simply to run with isync.
just edit MetaClasses.plist in the package and duplicate 6280 to 6288. (/Applications/iSync.app/Contents/PlugIns/ApplePhoneConduit.syncdevice/Contents/PlugIns/PhoneModelsSync/Contents/Resources/MetaClasses.plist)
to be honest - I've just placed the text from 6280 replacing 6280 with 6288 (only left 6280.tiff).
6288 is small improvement only to that model and this method gets isync working. oryginal file was backup'ed for security, but - it's works. enjoy.