Lost a lot of technology in tech tree migration

[lassombra]

I migrated from .16 to .17 today with a save that I have in which I had completed all non-infinite tech. However, now that save is missing a lot of techs in weird places, techs that didn't used to exist.

Is there anyway to get this to migrate to a similar place in the tech tree without making the map ineligible for achievements?

[Warlord]

They added in a few researches in the middle, sort of intermediates, such as rocket fuel research being earlier, or breaking out the rocket parts into their own researches.. These are technically "new" researches that you didn't have in the game before, so must be researched.

It's not a whole lot. If you are deep in the tree it shouldn't be too hard to get back to where you were before.

Might be worth starting a new map over, if you haven't played since .16.

[lassombra]

That's really frustrating. I was in the middle of refactoring the map to megabase scale and don't really feel like doing all of that over

[piccolo255]

Originally posted by lassombra:

That's really frustrating. I was in the middle of refactoring the map to megabase scale and don't really feel like doing all of that over

You can use console commands to research them (this'll disable achievements).
https://wiki.factorio.com/Console#Unlock_and_research_all_technologies

/c game.player.force.research_all_technologies()

To fine-tune it, you can use the commands here:
https://wiki.factorio.com/Console#Research_specific_technologies
https://wiki.factorio.com/Console#Unresearch_specific_technologies
(Internal technology names you'll need for tweaking commands are listed on the wiki pages for each tech.)

[brian_va]

Some of the recipes have likely changed as well on you. Maybe roll back to .16 and keep going.

[Grumpy Old Gamer]

If you have existing assemblers, they will continue to function on recipes that you do not have unlocked, as long as you dont change them. I do notice you said youa re rebuilding though, so that might be an issue. Unfortunately short of cheats commands, which disable achievements, you have exactly 2 options. Research the techs the normal way, or use the cheat command and then hack your save file. IIRC its just a single byte that you hav to edit that tells the game whether or not achievements are unlockable, but you will have to google it, and it requires a hex editor. Make a backup of yoru savegame before doing so.

[lassombra]

Originally posted by piccolo255:

...this'll disable achievements...

That unfortunately makes this a non-starter

Originally posted by Shadow Raider:

...hack your save file...

This unfortunately is not something I'm ok with doing. I know it's not hard, but I just don't like the idea of hacking anything for achievements.

Originally posted by brian_va:

...Maybe roll back to .16 and keep going.

This is more likely what I'll do to be honest.