anatom74

@JadinAndrews : If I see it right, it should work with atmega1280 also (I managed to get it working with original avr-boot, so I modified makefile in https://github.com/JadinAndrews/avr_boot/tree/master/build), but when...

I managed to get it working (atmega1280), but I see that it is flashing up to 65536 bytes long. Anything bigger will result in verify failure. `avrdude.exe: verification error, first...

Hmm, I think I got it (though I don't know if this is the right place) by adding following into prog_flash.h: `#if defined (__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) #define LARGE_ADDR_SPACE #endif`

From datasheet it might be a problem related to: > For I/O registers located in extended I/O map, "IN", "OUT", "SBIS", "SBIC", "CBI", and "SBI" instructions must be replaced with...

Tryed on 2.4.4, n NodeMCU and WEMOS D1, but still no devices discovered ad.: seems that resetting Echo Dot3 helped. Now it can discover all devices

a suggestion to support for swapping RX/TX pins (Bit 15 SWAP: Swap TX/RX pins)