Supported Hardware

Fidelity X currently supports a range of flight controllers based on the AT32F43x MCU family.

---

Officially Supported Flight Controllers

The following flight controllers have been thoroughly tested and receive official support:

NeutronRC Series

NeutronRCF435SE

Item	Specification
MCU	AT32F435RGT7
Package	LQFP64
Gyro	BMI270
Mounting	20x20mm / 30.5x30.5mm
Firmware	fydelix-NeutronRCF435SE

A versatile classic that accommodates both 20x20mm and 30.5x30.5mm mounting patterns, making it highly adaptable for various builds.

Read Before Purchasing

NeutronRC has released a newer revision of the F435SE under the same name, but equipped with an ICM42688P gyroscope. Fidelity X does NOT support this newer revision. Before purchasing, always confirm with the seller that the unit uses a BMI270 gyroscope.

NeutronRCF435MINI

Item	Specification
MCU	AT32F435CGU7
Package	QFN48
Gyro	BMI270
Size	20 x 20mm
Firmware	fydelix-NeutronRCF435MINI

Commonly found in NeutronRC’s AIO (All-In-One) integrated products.

Important Notes

• Gyroscope Compatibility: Only the BMI270 variant is supported; units equipped with ICM42688P are NOT compatible
• ESC Firmware Requirements: Only Bluejay, AM32, and BLHeli_32 ESC firmware are supported. Other ESC firmware is not compatible, with no plans to add support

---

NewBeeDrone Series

Hummingbird 200RS

Item	Specification
MCU	AT32F435
Gyro	BMI270 / ICM42688P
Size	20 x 20mm
Firmware	fydelix-Hummingbird200RS / fydelix-Hummingbird200RS_legacy

Hummingbird 255 V1

Item	Specification
MCU	AT32F435
Gyro	BMI270 / ICM42688P
Size	25.5 x 25.5mm
Firmware	fydelix-Hummingbird255V1REVA / fydelix-Hummingbird255V1REVA_legacy

Choosing the Right Firmware

The Hummingbird series comes in two gyroscope variants. Verify your hardware before flashing:

• Without _legacy suffix: For BMI270 gyroscope
• With _legacy suffix: For ICM42688P gyroscope

StingerBee

Item	Specification
MCU	AT32F435
Gyro	ICM42688P
Type	BNF (Bind-and-Fly) Kit
Use Case	Tiny Whoop
Firmware	fydelix-StingerBee

The StingerBee is a complete BNF (Bind-and-Fly) kit from NewBeeDrone—not a standalone flight controller board.

Factory Preset Information

The StingerBee firmware ships with factory presets customized by NewBeeDrone. Performing a factory reset will restore the NewBeeDrone factory presets, not the Fidelity X defaults.

---

Open Source Designs

ESMRPROTO2

Item	Specification
MCU	AT32F435
Gyro	BMI270 / ICM42688P
Type	Open-Source Hardware Design
Firmware	fydelix-ESMRPROTO2 / fydelix-ESMRPROTO2_legacy

ESMRPROTO2 is a widely adopted open-source flight controller schematic used by numerous commercial manufacturers and DIY enthusiasts alike. If your flight controller is based on this reference design, this firmware should be compatible.

Choosing the Right Firmware

The same selection rules apply as for the Hummingbird series:

• Without _legacy suffix: For BMI270 gyroscope
• With _legacy suffix: For ICM42688P gyroscope

---

Firmware Selection Guide

Naming Convention

fydelix-<board>-<version>-<git-commit>.hex

Example: fydelix-NeutronRCF435MINI-0.1.3-8ab496d.hex

Understanding Legacy Versions

Firmware files with the _legacy suffix are specifically built for flight controllers equipped with the ICM42688P gyroscope.

Firmware Type	Target Gyroscope
Standard (no suffix)	BMI270
Legacy (_legacy suffix)	ICM42688P

Flash the Correct Version

Flashing the wrong firmware variant will cause the gyroscope to malfunction, preventing the flight controller from arming. Always verify your gyroscope model before flashing.

---

Supported MCUs

AT32 Series

Chip	Package	Flash	RAM	Status
AT32F435CGU7	QFN48	1MB	384KB	✅ Full Support
AT32F435RGT7	LQFP64	1MB	384KB	✅ Full Support
AT32F437VMT7	LQFP100	4MB	384KB	✅ Full Support

STM32 Series

Chip	Package	Flash	RAM	Status
STM32G474CGU6	QFN48	512KB	128KB	🚧 In Development
STM32G473CGU6	QFN48	512KB	128KB	🚧 In Development

---

Supported Sensors

Gyroscope / Accelerometer

Sensor	Status	Notes
BMI270	✅ Full Support	Recommended
QMI8658C	✅ Full Support	Recommended
ICM42688P	⚠️ Limited Support	Not recommended for new designs

About ICM42688P Support

The ICM42688P currently receives only limited support and is strongly discouraged for any new flight controller designs. If you are developing a new flight controller or shopping for one, please prioritize units equipped with BMI270 or QMI8658C gyroscopes.

---

Requesting Support for New Hardware

If you are a flight controller manufacturer interested in official Fidelity X support for your product, please reach out to us via GitHub.