The SPR  F3 builds on tried and tested software, processor and sensor technology to make your aircraft fly like it’s on rails.
ST debug port on the back of the board have (SWD) and startup mode selection, not deadlock bootloader.
There MEGA328 ISP port on the back of the board, will not deadlock bootloader.
looptime up to about 2 times the previous generation based stm32F1 flight control.

No-Compromise I/O
Use all the features all the time; e.g. Connect your OSD + SmartPort + SBus + GPS + LED Strip + Battery Monitoring + Sonar + 8 motors – all
at the same time.

Configurable
The SP F3 runs Cleanflight which can be configured to suit your needs using a cross-platform GUI (Windows/OSX/Linux).

Tiny and lightweight
The RacingF3 has a standard 36x36mm form-factor with 30.5mm mounting holes and weighs just 6 grams.

Flight Logging
On-board high-capacity black box flight log recorder – optimize your tuning and see the results of your setup without guesswork.

New Generation CPU
STM32 F3 support next-generation processor Attitude efficient hardware floating-point operations, and faster ARM Cortex M4 core computing.

Interface
All using 2.54 interface. PDB can be more perfect combination.

OneShot ESC
Full support for OneShot ESCs for easy PID tuning and a sharper response.

Broad RC receiver Support
Supports SBus, SumH, SumD, Spektrum1024/2048, XBus, PPM, PWM receivers. No external inverters required (built-in).

Programmable LED
Dedicated output for programmable LEDs – great for orientation, racing and night flying.

Battery Monitoring
Battery monitoring ports for voltage and current.

Sonar
Sonar support for precision low-altitude hold.

I2C Port
I2C port always powered, perfect for external sensors or always-on OLED Screen.

Buzzer
Buzzer port for audible warnings and notification

Software
F3 + OSD run the company to modify the optimization of cleanflight flight control software (FC).
We will continue to update the firmware for our customers to provide a better flying experience