Rover-4.2.2 has been released as the stable version and can be downloaded using Mission Planner, QGC or downloaded directly from firmware.ardupilot.org.
The changes vs 4.2.1 are in the release-notes and also copied below:
- MambaH743v4 and MambaF405 MK4 autopilot support
- Second full harmonic notches available (see INS_HNTC2_ parameters)
- UAVCAN memory usage reduced (see CAN_Dn_UC_POOL parameter to control DroneCAN pool size)
- Watchdog (caused by hardfault) saves crash dump logs to SD card
- Bug fixes
a) CRSF protection against watchdog on bad frames
b) CRSF reset in flight handled
c) FFT init watchdog fix when ARMING_REQUIRE=0
d) OSD flight modes menu includes newer flight modes
e) Param download (via MAVFTP) fixed for params with overlapping names
f) PWM rangefinder bug fix and added SCALING parameter support
g) Replay bug fix when EK3_SRCs changed
h) SERIALx_OPTION fix when “Don’t forward mavlink to/from” selected (resolves MAVLink gimbal detection)
i) VL53L1X rangefinder preserves addresses
This release actually went out on Jun 28th but during the mix-up with the Copter-4.2.2 release I neglected to publish a release announcement, sorry!