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About these hex and eep files

optiboot.hex

Optiboot UART bootloader. Baud set to 57600 for maximum compatibility.

optiboot_superspeed.hex

Optiboot UART bootloader. Baud set to 1000000 which is the fastest an 8MHz AVR can run its UART at. Reduces upload time from ~14 seconds to ~5 seconds (27174 bytes).
Tested on Windows and Linux with CH340G USB-serial converter. Should work with most other converters. However AVRDUDE on Linux needs a minor modification to support 1Mb, see this - https://github.com/zkemble/avrdude/tree/custombaud

watch_eng.hex

The main program in English.

watch_rus.hex

The main program in Russian.

watch.eep

EEPROM data. This must be uploaded along with watch_(lang).hex, it contains the beep tunes and other bits of data.