$100 base model. Open Source KiCAD 7 hardware powered by Hellen-One
powerted by rusEFI firmware
1mg of flash is required.
One day we shall try https://jlcpcb.com/partdetail/Stmicroelectronics-STM32F427VIT6%2FC57097#EC or https://jlcpcb.com/partdetail/Stmicroelectronics-STM32F437VIT7%2FC1338578#EC
You would need three files from boards/uaefi-a/board folder to place your JLCPB Assembly order: gerber.zip BOM-JLC.csv and CPL.csv
https://www.shop.rusefi.com/shop/p/uaefi-ultra-affordable-efi