I am looking to help a friend and he has an old LCX 15 MT with an old softwrare version 2.9.Lowrance took all the updates for their older units off line.They now have update 3.7 but that won't work to update his unit. We need version 3.6 to update his older unit.It seems the older units you have to update in steps.
Any help would be greatly appreciated.

mapman