How do I restore Epic and Legendary to the tech tree after mod removal? (It's not 2.1 compatible) Only Uncommon and Rare is available to research, the later tech is missing.

I've tried these commands but they make no difference:
/c game.player.force.reset_technologies()
/c game.player.force.reset_technology_effects()

I haven’t thought of that, I’ll look at it

Of course even better would be a 2.1 update instead :)

Just to let both of you know, having looked over the mod's code, it seems as though nothing changed in 2.1 that would make this mod stop working.

Simply changing the info.json file to the following allows the mod to work in 2.1 without any issues (tested against 2.1.11)

{
"name": "quality_unlocked",
"version": "1.2.3",
"title": "Quality Unlocked",
"author": "Cee lo",
"description": "Unlocks all quality levels when quality module technology is researched\n\nFor Space Exploration compatibility: manually change quality from \"! quality\" to \"? quality\" in SE's info.json, enable quality mod support in SE settings, then install the \"Quality Unlocked - SE Compatibility\" mod.",
"factorio_version": "2.1.9",
"dependencies": ["quality", "? space-exploration"]
}