Previously unlocked maps in 3.17

At the moment my Atlas looks very empty :) So with the new update (3.17) do I have to unlock all maps on the Atlas again?
What about the previously completed maps? Do I have to replay all maps even if they are low tier?

EDIT: I read about getting the maps unlocked by using legacy maps? How do I get these?

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RHX_RetroHelix wrote:

At the moment my Atlas looks very empty :) So with the new update (3.17) do I have to unlock all maps on the Atlas again?
What about the previously completed maps? Do I have to replay all maps even if they are low tier?

EDIT: I read about getting the maps unlocked by using legacy maps? How do I get these?

Legacy maps are maps from previous release so 3.16 and before.
If you have already converted your maps, then you will need to buy them on trade. For it to work, it has to be a LEGACY Yellow T16 CORRUPTED map.

Then after running and completing that, your atlas will autocomplete to 113/117 and then you just need to run 4 T16 maps NON legacy = 3.17 maps to complete your atlas again.

All right. Will try this. Thank you.