I have a 'mark 5.2' ECU as well. I see that you chose F30247 + configF2027 whereas I chose F30247 + configF2017. I'm not an expert on which is correct, but I chose what I did because I have a Model Y. On the
update webpage, the black table seemed to confirm my pick. Perhaps you can retry with that update instead.
I tried updating the firmware using a 64GB SDHC card (smallest that I had on hand) although they recommended 32GB max. I don't think the update succeeded, the light didn't flash as they said it should. Since then, I got a 32GB SDHC card and figured that I'd try again once I got my replacement beeper since I'll need to remove the cover then as well.
They seemed pretty responsive through the Telegram app (even though it seemed to take an eternity when your frunk is torn apart).
Another installation issue that I had was the latch needed to be adjusted a little (maybe 1/4 of an inch) higher than my first attempt. Originally when latched, you could tell the hood being latched too firmly by the way it was being flexed. Also, it would fail to properly latch once every 4 times or so. This adjustment was super easy to do even after I had the frunk all re-installed since I was able to access the latch through the frunk's front panel.