GitHub - chipKIT32/pic32-Arduino-USB-Bootloader-original: stk500v2 bootloader via builtin USB port for Pic32
Installing an Arduino Bootloader - learn.sparkfun.com
STM32 Bootloader | Programming STM32F103C via USB Port - YouTube
Installing an Arduino Bootloader - learn.sparkfun.com
Upload STM32F103C8T6 USB Bootloader | Program STM32 via USB Port
Nano With The Bootloader Compatible Nano 3.0 Controller For Arduino Ch340 Usb Driver 16mhz Nano V3.0 Atmega328p/168p - Integrated Circuits - AliExpress
Mini / Type-c / Micro Usb Nano 3.0 With The Bootloader Compatible Nano Controller For Arduino Ch340 Usb Driver 16mhz Atmega328p - Integrated Circuits - AliExpress
STM32 Bootloader | Programming STM32 using usb cable | Flashing bootloader in STM32 | Arduino IDE - YouTube