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Juno FDxboot 1.32 is a truly universal Bootloader for 8-bit AVR MCU with less than 128-byte per page. It's a less than 1k bootloader that doesn't need any modification. Compile and it just works. 1.32 added extra watchdog code for auto-uploading using watchdog, and added a function to read back fuses.

Max upload speed on an Atmega88 with 64 bytes per page, 3+ times faster than a typical USBasp.
7144/0.95=7520 byte/s

FDxboot 1.32 features:
-- High upload speed 18kB/s tested on an Atmega328p;
-- ALL Hand code ASM codes, no header used from AVR-C;
-- It's a project written main in C over several months with good comments;
-- Auto upload is possible with USART as demonstrated here