4.2 is a stable branch, see also changelog 4.1.
Supported models:
Giga (KN-1010)
Hero (KN-1011)
Start/Starter (KN-1110, KN-1111, KN-1112)
Lite (KN-1310)
Omni (KN-1410)
City (KN-1510)
Air/Explorer (KN-1610, KN-1613)
Extra/Carrier (KN-1710, KN-1711, KN-1713)
Ultra/Titan (KN-1810, KN-1811)
Viva/Skipper (KN-1910, KN-1913)
Omni DSL (KN-2011, KN-2012)
Extra DSL/Carrier DSL/Skipper DSL (KN-2111, KN-2112)
Runner 4G (KN-2210, KN-2211, KN-2212)
Hero 4G (KN-2310, KN-2311)
Hero DSL (KN-2410)
Peak DSL (KN-2510)
Giant (KN-2610)
Peak (KN-2710)
Orbiter Pro (KN-2810)
Skipper 4G (KN-2910)
Speedster (KN-3010, KN-3012)
Buddy 4 (KN-3210, KN-3211)
Buddy 5 (KN-3311)
Buddy 6 (KN-3411)
Voyager Pro (KN-3510)
Hopper DSL (KN-3610)
Sprinter (KN-3710)
Hopper (KN-3810)
Explorer 4G (KN-4910)