ATMEGA blew up

[AutoWiz]

2.0.7.3 is the latest and while the 8 bit boards are technically capable of running marlin 2.x the reality of all that is the larger firmware size of the 2.x makes the 8 bit boards struggle a lot more and leave more of them blobs on the surface of your prints from the momentary studders here and there as the processor tries to catch up to real time. If you have an 8 bit board with marlin 2.x and no complaints of this well then you must be printing at a pretty slow speed.