Software versions are unit specific...
I think the concensus is that 6.490 is the last stable version for the 998...
Unfortunately that version will not operate the AS GPS HS antenna ...
Some are having image issues with the new versions....some are saying its the best version they've ever used...
We hope HB is working on it...(at least those of us that have yukky images are hoping anyway)...
My AS GPS HS antenna is idle until HB releases a version that I can see brush again on my 1197...
Rickie