First flash this bin file to expresslrs TX module by wifi mode. Then you can upgrade to v3.x.x firmware version for the tx module Bin file download: repartitioner You can check more details on ExpressLRS github website https://github.com/ExpressLRS/repartitioner
Firmware Hex file (Betaflight 4.3.0 norevision): Betaflight 4.3.0 for Crux35 Frsky versionCompatible with CrazyF411 PRO FRSKY ICM42688P version (Latest version), Recommend flash firmware by betaflight configurator 10.7.x or 10.8.x Dump file: Dump file for Crux35 Frsky betaflight 4.3.0
SPI ELRS： Walksnail and HDZERO SPI ELRS version firmware(BF4.3.1) support ELRS v2.x.x betaflight_4.3.1_STM32F411SX1280 Walksnail and HDZERO SPI ELRS version firmware(BF4.3.1) support ELRS v3.x.x betaflight_4.3.1_CRAZYBEEF4SX1280_ICM42688P_ELRS_V3.0 Dump file for Walksnail SPI ELRS version Bassline Walksnail spi elrs version dump all Dump file for HDZERO SPI ELRS version Bassline HDZERO spi elrs dump all UART ELRS： Walksnail UART…
Firmware Hex file (Betaflight official 4.3.1): betaflight_4.3.1_STM32F411 Dump file: dump for Crux35 analog ELRS V2 dump for Crux35 HDZERO and HD DJI ELRS V2 Manual: Crux35 Crux35HD DJI and Crux35 HDZERO FPV Racer Drone ELRS V2 manual Bind procedure video: