Versions and compatibility¶

Which firmware release works with which bootloader, Python library, PAR6 runtime and board revision. One row per firmware release, newest first.

Firmware	Released	Bootloader	STEPFOC equivalent	Python library (Spectral-BLDC)	PAR6 runtime	Spectral Micro PCB	Docs
107	2026-08-26	required	108 (STEPFOC 107 has the Send_Settings and PD changes of this release, without its calibration fix)	1.20 or newer	0.9 or newer	v2.0	107
106	2026-07-06	required	106	1.19 or newer	0.9 or newer	v2.0	not published
105	2026-07-05	required	105	1.19 or newer	0.9 or newer	v2.0	not published
104	2026-06-19	required (the first release built for the bootloader, from Bootloader_main)	none (STEPFOC has no 104 release)	1.19 or newer (1.20 for Send_Voltage_Limit)	0.9 or newer	v2.0	101 applies; 104 adds Send_Respond_Kt, Send_Voltage_Limit (in the release image) and the bootloader
101	2025-09-29	none (flashed with a programming adapter)	103	1.17 or newer	0.9 or newer	v2.0	101

#Info prints the firmware release a driver runs; Send_Respond_Device_Info returns it over CAN.

Comments