5V Micro USB Tiny AVR ISP ATtiny44 ATTiny45 ATTiny85 USBTinyISP Programmer Module For Arduino IDE Bootloader ISP Microcontroller
Installing an Arduino Bootloader - SparkFun Learn
Amazon.com: BIT-C Pro Micro MCU with USB-C & DFU bootloader (ATmega32U4, 5V/16MHz) (Black) : Electronics
How to burn bootloader on the Nano-Every board? - Avrdude, stk500, Bootloader issues - Arduino Forum
USBtinyISP V2 AVR Programmer
Pololu USB AVR Programmer v2.1
Programming ATtiny85 IC directly through USB without Arduino using Digispark Bootloader
Amazon.com: Geekstory for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro : Electronics
USB bootloaders for AVR microcontrollers - Do It Easy With ScienceProg
Amazon.com: HiLetgo USBTiny USBtinyISP AVR ISP Programmer 6/10 Pin Bootloader for Arduino UNO MEGA : Electronics
Mini USBTiny AVR Atmel Programmer
Programming an ATmega328 with Arduino bootloader via a FTDI USB-serial adapter - Electrical Engineering Stack Exchange
SD bootloader for Atmel AT32UC3 devices
Loading Arduino Bootloader to a brand new ATMEL Microcontroller chip
avr - I bought USB > FT232RL, can I use it to program a bootloader onto an Arduino? - Arduino Stack Exchange