The following is the STM32F051 version information:

AM32 firmware new version download address and corresponding target:

https://am32.ca/downloads

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The following is the AT32F421 version information:

AM32 firmware new version download address and corresponding target:

https://am32.ca/downloads

SIZE:                                 32*16.5MM

Weight：                           4.2g

Continuous current:          70A

Maximum current(5S):      90A

Input Voltage:                    3-6S Lipo

Processor:                         AT32F421K8U7

BEC:                                  NO

Dirve Signal  Support:       Dshot 150-600

Current Sensor:                 support

Teleetry Passback:            Support

Frimware Version:             AM32(AM32_AT32DEV_F421)

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Recommended Soldering and Setup:

https://www.youtube.com/watch?v=rEQGSs3m8YU

From December 1, 2022, follow-up orders will add 1PCS red heat sink accessories, as shown in the picture for details.