Betaflight Receiver and RC link: CLI settings

Serial receiver protocol and inversion, channel ranges, RC smoothing, RSSI source and scaling, and the SPI receiver settings for boards with an on-board ELRS, FrSky or Spektrum radio.

32 settings in Betaflight 2026.6, plus 1 that earlier releases had. Each range and value list is read from the firmware's settings.c, each default from the CLI get of the release built for the simulator (no board config applied), so a board's own config can still change it. Set one with set name = value, then save. Paste a diff all into the CLI checker to test it against any release.

Setting	Type	Range or values	Default	4.4	4.5	2025.12	2026.6	Notes
`airmode_start_throttle_percent` #	uint8 global	0 to 100	`25`	✓	✓	✓	✓
`crsf_use_negotiated_baud` #	uint8 global	OFF, ON	`OFF` needs USE_CRSF_V3	✓	✓	✓	✓
`fpv_mix_degrees` #	uint8 global	0 to 90	`0`	✓	✓	✓	✓
`max_aux_channels` #	uint8 global	0 to 14	`set by the target`	✓	✓	✓	✓
`max_check` #	uint16 global	750 to 2250	`1900`	✓	✓	✓	✓
`mid_rc` #	uint16 global	1200 to 1700	`1500`	✓	✓	✓	✓
`min_check` #	uint16 global	750 to 2250	`1050`	✓	✓	✓	✓
`msp_override_channels_mask` #	uint32 global	0 to 262143	`0` needs USE_RX_MSP_OVERRIDE	✓	✓	✓	✓
`msp_override_failsafe` #	uint8 global	OFF, ON	`OFF` needs USE_RX_MSP_OVERRIDE	—	✓	✓	✓
`rc_smoothing` #	uint8 global	OFF, ON	`ON` needs USE_RC_SMOOTHING_FILTER	✓	✓	✓	✓
`rc_smoothing_auto_factor` #	uint8 global	0 to 250	`30` needs USE_RC_SMOOTHING_FILTER	✓	✓	✓	✓
`rc_smoothing_auto_factor_throttle` #	uint8 global	0 to 250	`30` needs USE_RC_SMOOTHING_FILTER	✓	✓	✓	✓
`rc_smoothing_debug_axis` #	uint8 global	ROLL, PITCH, YAW, THROTTLE	`ROLL` needs USE_RC_SMOOTHING_FILTER	✓	✓	✓	✓
`rc_smoothing_feedforward_cutoff` #	uint8 global	0 to 255	`0` needs USE_RC_SMOOTHING_FILTER	✓	✓	—	—	Removed in 2025.12.
`rc_smoothing_setpoint_cutoff` #	uint8 global	0 to 255	`0` needs USE_RC_SMOOTHING_FILTER	✓	✓	✓	✓
`rc_smoothing_throttle_cutoff` #	uint8 global	0 to 255	`0` needs USE_RC_SMOOTHING_FILTER	✓	✓	✓	✓
`rssi_channel` #	int8 global	0 to 18	`0`	✓	✓	✓	✓
`rssi_invert` #	int8 global	OFF, ON	`OFF`	✓	✓	✓	✓
`rssi_offset` #	int8 global	-100 to 100	`0`	✓	✓	✓	✓
`rssi_scale` #	uint8 global	1 to 255	`100`	✓	✓	✓	✓
`rssi_smoothing` #	uint8 global	0 to 255	`125`	✓	✓	✓	✓
`rssi_src_frame_errors` #	int8 global	OFF, ON	`OFF`	✓	✓	✓	✓
`rssi_src_frame_lpf_period` #	uint8 global	0 to 255	`30`	✓	✓	✓	✓
`rx_max_usec` #	uint16 global	750 to 2250	`2115`	✓	✓	✓	✓
`rx_min_usec` #	uint16 global	750 to 2250	`885`	✓	✓	✓	✓
`sbus_baud_fast` #	uint8 global	OFF, ON	`OFF` needs USE_SERIALRX_SBUS	✓	✓	✓	✓
`serialrx_halfduplex` #	uint8 global	OFF, ON	`set by the target`	✓	✓	✓	✓
`serialrx_inverted` #	uint8 global	OFF, ON	`OFF` needs USE_SERIALRX	✓	✓	✓	✓
`serialrx_provider` #	uint8 global	17 values NONE, SPEK2048, SBUS, SUMD, SUMH, XB-B, XB-B-RJ01, IBUS, JETIEXBUS, CRSF, SRXL, CUSTOM, FPORT, SRXL2, GHST, SPEK1024, MAVLINK	`set by the target` needs USE_SERIALRX	✓	Δ	Δ	✓	4.5: new values NONE 2025.12: new values MAVLINK
`spektrum_sat_bind` #	uint8 global	0 to 10	`0` needs USE_SPEKTRUM_BIND	✓	✓	✓	✓
`spektrum_sat_bind_autoreset` #	uint8 global	OFF, ON	`ON` needs USE_SPEKTRUM_BIND	✓	✓	✓	✓
`srxl2_baud_fast` #	uint8 global	OFF, ON	`ON` needs USE_SERIALRX_SRXL2	✓	✓	✓	✓
`srxl2_unit_id` #	uint8 global	0 to 15	`1` needs USE_SERIALRX_SRXL2	✓	✓	✓	✓

✓ present, Δ changed in that release (hover for what changed), — not in that release. “needs USE_…” is the build option the setting is compiled with: a cloud build without it has no such setting.

Also in this section

These settings exist in 2026.6, but their default depends on build options the simulator build does not compile (DShot, RPM filter, board drivers), so it is not printed here rather than guessed: cc2500_spi_chip_detect, expresslrs_domain, expresslrs_model_id, expresslrs_uid, flysky_spi_rf_channels, flysky_spi_tx_id, frsky_spi_a1_source, frsky_spi_autobind, frsky_spi_bind_hop_data, frsky_spi_offset, frsky_spi_tx_id, frsky_x_rx_num, input_filtering_mode, rx_spi_bus, rx_spi_led_inversion, rx_spi_protocol, spektrum_spi_mfg_id, spektrum_spi_num_channels, spektrum_spi_protocol.

Other sections

Gyro and D-term filters (27)
PID tuning (73)
Angle, horizon and launch modes (20)
Rates and throttle curve (25)
Motors and ESC (23)
Failsafe and arming (14)
GPS (14)
GPS rescue (12)
Autopilot, position and altitude hold (66)
Battery and current sensor (28)
OSD (49)
OSD element positions (90)
VTX and camera control (12)
Blackbox and debug (20)
Telemetry and serial (44)
LED strip and beeper (12)
Sensors and board alignment (35)
System and hardware (25)

What changed between releases: 4.4 → 4.5 · 4.5 → 2025.12 · 2025.12 → 2026.6. Machine-readable: params.json (2026.6.2), GPL-3.0 like the firmware it comes from.