I actually bought my very first Raspberry Pi to use with RecalBox, and I instinctively bought the last one: 3B+ ! so now I can't make my Recal Box with the pi I specifically bought for this purpose.

Of course the team working on RecalBox is busy, and works at its own pace and however they want and that's fine

But maybe it would be good to display a visible disclaimer on the RecalBox homepage and download page, because it took me a month (and buying a new power adapter) to finally end up on this page on the forum to understand why I got the yellow thunderbolt with my Pi (the yellow thunderbolt is said to indicate a power problem, and there are no disclaimers anywhere about Pi 3B+ and Recalbox, or not anywhere I looked for the past weeks anyway...)

Just my 2 cents.
(again, this is not a criticism against the dev team. I do hope you'll be able to make recalbox compatible as soon as possible, but I understand that it's not ready and I'm grateful for the work you do. I'm just really really frustrated XD)