Tracker-4.5.5 has been released and should appear in the ground stations as the official release within a few hours. It will also appear here on firmware.ardupilot.org
The changes vs 4.5.4 are in the ReleaseNotes and copied below
Changes from 4.5.4
- Board specific enhancements and bug fixes
- CubeRed’s second core disabled at boot to avoid spurious writes to RAM
- CubeRed bootloader’s dual endpoint update method fixed
- fixed IOMCU transmission errors when using bdshot
- update relay parameter names on various boards
- add ASP5033 airspeed in minimal builds
- added RadiolinkPIX6
- fix Aocoda-RC H743Dual motor issue
- use ICM45686 as an ICM20649 alternative in CubeRedPrimary
- System level minor enhancements and bug fixes
- correct use-after-free in script statistics
- added arming check for eeprom full
- fixed a block logging issue which caused log messages to be dropped
- enable Socket SO_REUSEADDR on LwIP
- removed IST8310 overrun message
- added Siyi ZT6 support
- added BTFL sidebar symbols to the OSD
- added CRSF extended link stats to the OSD
- use the ESC with the highest RPM in the OSD when only one can be displayed
- support all Tramp power levels on high power VTXs
- emit jump count in missions even if no limit
- improve the bitmask indicating persistent parameters on bootloader flash
- fix duplicate error condition in the MicroStrain7
- Other minor enhancements and bug fixes
- specify pymonocypher version in more places
- added DroneCAN dependencies to custom builds
Thanks very much to everyone who has worked so hard on this release including the beta testers!