scrumfled:
I've installed optiboot into the ide and followed the instructions on github to add the boards info.
Please post a link to the optiboot and instructions. I know you already solved your issue by using MightyCore but if there's an issue with the other it would be nice to try to fix it.
scrumfled:
its a shame the IDE doesnt migrate what you already have on an upgrade though.
What do you mean by that?