Hi there, thanks for the replies. I'm still new to armbian and trying to figure out what's it's all about.
As far as I can tell the BTT "3.0.0" looks like the current image from armbian.com, both bookworm with 6.6.60.
What I can't tell if BTT has better/newer drivers or fixes. Like the mentioned ghost touches in combination with the 35tft spi.
Can't fully grasp armbian-upgrade but it looks like it would override those things?