Try this as it is being shown in the Google Centaur Modification group.
DGT Centaur - Display replacement
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Sorry pressed the return key by mistake. https://www.waveshare.com/product/displays/e-paper/epaper-2/2.9inch-e-paper.htm
Nice 
Many thanks for your response. That helped me a lot. I'll try it out soon.
Feb 5, 2022
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#6
Is this the correct replacement part for the e-paper display of DGT Centaur? Here's the link: https://www.waveshare.com/product/displays/e-paper/epaper-2/2.9inch-e-paper-d.htm?fbclid=IwAR2yLyGg2Y6OEMLKmsf31R84zVkKNJBV7BvND17QO-1yd1cvPBYMEaeFxco
I tried to upgrade my Centaur to play on Lichess, but at least with the new firmware this display didn't respond.
The upgrade should work fine with the new model.
Unfortunately i got the new board (with no visible rings), but still with the old version of display.
Maybe it would operate with the original firmware?
Lately I've only been playing with the Pegasus and didn't tried to fix the old board.
How are you going to upgrade a Centaur to play online? It simple can't - and no software download will enable it to so so.
You can enable online play, but it's more a hack than an upgrade.
All in German - as Greyville.
https://schach.computer/dgt-centaur-v2-das-finale-release/
I have done this conversion to enable me to play against other chess engines and a few old chess computer.
Sorry, pressed the return carriage and posted only half of what I was about to say. Anyway, you will need to change your Raspberry Pi to a Raspberry Pi Zero 2 and program that. I just wanted to play against other chess engines instead of Stockfish which I can now do. I don't like playing online with a real board as I prefer doing that on my tablet. The Centaur modification is very easy to do.
Merry Christmas everyone,
Can somebody tell me the exact (or driver-compatible) model of the new displays (since ~2020) or share a link to a shop so i can order a new one and replace it by myself?
Thank you