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Not sure what happened but you should not downgrade and reformat (which is was for map updates previously) a MY 2020 APIM, although it may still work if it was built in 2019 like mine was.
Also, Cyanlabs is currently recommending MY2020+ do the 21020 update separately from the NA 2.20 map update. Supposedly the Sync3 Updater has been updated for MY2020, or you can do the map update separately by preparing your own USB stick in the thread I linked previously. I used the Sync3 Updater to prepare the USB stick for 21020 and then prepared the USB stick myself for the map update. Everything seems snappy, although I don't use the stock navigation very much.