Fujin at BetaFlights github has put together some updates to get smart audio 2.1 to fallback to smart audio 2.0. This was tested on a build of the target CRAZYBEEF4DX. Do this at your own risk.
This is a temporary fix as this should be in the main builds soon.
How to flash BetaFlight firmware.
BetaFlight 4.0.0
betaflight_4_SPRACINGF7DUAL
betaflight_4_0_0_AIR32
betaflight_4_0_0_AIORACERF3
betaflight_4_0_0_AG3XF7
betaflight_4_0_0_AIKONF4
betaflight_4_0_0_ZCOREF3
betaflight_4_0_0_AG3XF4
betaflight_4_0_0_YUPIF7
betaflight_4_0_0_STM32F405
betaflight_4_0_0_YUPIF4
betaflight_4_0_0_VRRACE
betaflight_4_0_0_XRACERF4
betaflight_4_0_0_TINYBEEF3
betaflight_4_0_0_UAVPNG030MINI
betaflight_4_0_0_WORMFC
betaflight_4_0_0_X_RACERSPI
betaflight_4_0_0_TINYFISH
betaflight_4_0_0_SPRACINGF7DUAL
betaflight_4_0_0_STM32F4DISCOVERY
betaflight_4_0_0_STM32F7X2
betaflight_4_0_0_STACKX
betaflight_4_0_0_STM32F411DISCOVERY
betaflight_4_0_0_SPRACINGF4NEO
betaflight_4_0_0_SPRACINGF4EVO
betaflight_4_0_0_STM32F3DISCOVERY
betaflight_4_0_0_SPRACINGF3MQ
betaflight_4_0_0_SPEDIXF4
betaflight_4_0_0_SPRACINGF3EVO
betaflight_4_0_0_SPEKTRUMF400
betaflight_4_0_0_SPRACINGF3NEO
betaflight_4_0_0_SPARKY2
betaflight_4_0_0_SOULF4
betaflight_4_0_0_SPRACINGF3
betaflight_4_0_0_SPRACINGF3MINI
betaflight_4_0_0_SPEEDYBEEF4
betaflight_4_0_0_REVOLTOSD
betaflight_4_0_0_SPARKY
betaflight_4_0_0_SKYZONEF405
betaflight_4_0_0_SINGULARITY
betaflight_4_0_0_RMDO
betaflight_4_0_0_SITL
betaflight_4_0_0_RG_SSD_F3
betaflight_4_0_0_REVOLT
betaflight_4_0_0_REVONANO
betaflight_4_0_0_RACEBASE
betaflight_4_0_0_OMNIBUSF7V2
betaflight_4_0_0_PYRODRONEF4
betaflight_4_0_0_RCEXPLORERF3
betaflight_4_0_0_OMNINXT4
betaflight_4_0_0_REVO
betaflight_4_0_0_PIRXF4
betaflight_4_0_0_PLUMF4
betaflight_4_0_0_OMNINXT7
betaflight_4_0_0_PODIUMF4
betaflight_4_0_0_OMNIBUSF7
betaflight_4_0_0_OMNIBUSF4FW
betaflight_4_0_0_OMNIBUSF4V6
betaflight_4_0_0_OMNIBUSF4SD
betaflight_4_0_0_NUCLEOF722
betaflight_4_0_0_OMNIBUSF4
betaflight_4_0_0_OMNIBUS
betaflight_4_0_0_NUCLEOF446RE
betaflight_4_0_0_NOX
betaflight_4_0_0_NERO
betaflight_4_0_0_MLTYPHF4
betaflight_4_0_0_MATEKF722SE
betaflight_4_0_0_MULTIFLITEPICO
betaflight_4_0_0_MLTEMPF4
betaflight_4_0_0_MOTOLAB
betaflight_4_0_0_NUCLEOF7
betaflight_4_0_0_MATEKF405
betaflight_4_0_0_MIDELICF3
betaflight_4_0_0_MATEKF411
betaflight_4_0_0_LUXV2_RACE
betaflight_4_0_0_MATEKF722
betaflight_4_0_0_MATEKF411RX
betaflight_4_0_0_LUXF4OSD
betaflight_4_0_0_KIWIF4
betaflight_4_0_0_KIWIF4V2
betaflight_4_0_0_KISSFCV2F7
betaflight_4_0_0_LUMBAF3
betaflight_4_0_0_KISSCC
betaflight_4_0_0_KISSFC
betaflight_4_0_0_KAKUTEF7V2
betaflight_4_0_0_KAKUTEF7
betaflight_4_0_0_KAKUTEF4V2
betaflight_4_0_0_ISHAPEDF3
betaflight_4_0_0_KAKUTEF4
betaflight_4_0_0_HAKRCF722
betaflight_4_0_0_HAKRCF405
betaflight_4_0_0_IRCSYNERGYF3
betaflight_4_0_0_IMPULSERCF3
betaflight_4_0_0_IRCFUSIONF3
betaflight_4_0_0_FRSKYF3
betaflight_4_0_0_FURYF7
betaflight_4_0_0_FURYF4OSD
betaflight_4_0_0_FURYF4
betaflight_4_0_0_FRSKYF4
betaflight_4_0_0_FOXEERF405
betaflight_4_0_0_FURYF3OSD
betaflight_4_0_0_FLYWOOF405
betaflight_4_0_0_FURYF3
betaflight_4_0_0_FPVM_BETAFLIGHTF7
betaflight_4_0_0_FOXEERF722DUAL
betaflight_4_0_0_FISHDRONEF4
betaflight_4_0_0_FF_PIKOBLX
betaflight_4_0_0_FLYWOOF7DUAL
betaflight_4_0_0_FLIP32F3OSD
betaflight_4_0_0_FF_RADIANCE
betaflight_4_0_0_FF_PIKOF4
betaflight_4_0_0_FF_PIKOF4OSD
betaflight_4_0_0_FF_FORTINIF4
betaflight_4_0_0_DYSF4PRO
betaflight_4_0_0_EXUAVF4PRO
betaflight_4_0_0_FF_FORTINIF4_REV03
betaflight_4_0_0_FF_KOMBINI
betaflight_4_0_0_ELINF405
betaflight_4_0_0_FF_ACROWHOOPSP
betaflight_4_0_0_F4BY
betaflight_4_0_0_EACHIF3
betaflight_4_0_0_EXF722DUAL
betaflight_4_0_0_ELLE0
betaflight_4_0_0_DOGE
betaflight_4_0_0_DALRCF405
betaflight_4_0_0_DALRCF722DUAL
betaflight_4_0_0_CRAZYFLIE2BQ
betaflight_4_0_0_CRAZYFLIE2
betaflight_4_0_0_CRAZYBEEF4FS
betaflight_4_0_0_CRAZYBEEF4FR
betaflight_4_0_0_CRAZYBEEF4DX
betaflight_4_0_0_COLIBRI_RACE
betaflight_4_0_0_COLIBRI
betaflight_4_0_0_CRAZYBEEF3FS
betaflight_4_0_0_COLIBRI_OPBL
betaflight_4_0_0_CRAZYBEEF3FR
betaflight_4_0_0_CRAZYBEEF3DX
betaflight_4_0_0_CLRACINGF4
betaflight_4_0_0_CLRACINGF7
betaflight_4_0_0_CHEBUZZF3
betaflight_4_0_0_BETAFLIGHTF4
betaflight_4_0_0_BEEROTORF4
betaflight_4_0_0_BETAFLIGHTF3
betaflight_4_0_0_BLUEJAYF4
betaflight_4_0_0_ANYFCM7
betaflight_4_0_0_BEESTORM
betaflight_4_0_0_BEEBRAIN_V2F
betaflight_4_0_0_ALIENWHOOPF7
betaflight_4_0_0_ALIENFLIGHTNGF7
betaflight_4_0_0_ANYFCF7
betaflight_4_0_0_ALIENFLIGHTF4
betaflight_4_0_0_BEEBRAIN_V2D
betaflight_4_0_0_ALIENWHOOPF4
betaflight_4_0_0_AIRBOTF4SD
betaflight_4_0_0_ALIENFLIGHTF3
betaflight_4_0_0_AIRHEROF3
betaflight_4_0_0_AIRBOTF4
Is this a solution specific for the TBS Unify Nano or a broader solution for the Smart Audio 2.1? Do you know if it also works with a TBS Unify Pro HV – Race 2?
It’s specific to 2.1 smart audio.