[Milhouse]

Still on version 0711 so it's time to deal with this dreadful task of removing Berryboot and start all over with PINN. The alpha-tree can update properly then?

Should do - PINN is a supported LibreELEC option, as it doesn't require a butchered LibreELEC system in order to work.

The RPi3B is sometimes abit slow. Is there an alternative for lets say a maximum of 100 euros? Intel Up looks really nice.

The Pi3B+ is a little faster than the Pi3B. If the slow performance is due to your SD card (reading/writing images etc., database updates) then I would recommend an A1 class SD card - my 32GB SanDisk Ultra A1 can sequentially write at over 25MB/s without a problem, while my older/slower card (Class 10) couldn't write at more than 7MB/s).

There are a few other threads around these parts for discussing alternative hardware (mostly ARM based, some of which run versions of LibreELEC). Personally, I'd avoid Intel just because they're often very buggy - when Intel stuff works it's usually great, but when they don't you're usually stuffed. Not sure what Intel hardware you could buy for 100 Euros, maybe something second hand...

Anyway, alternative hardware discussion is OT for this thread so please find one of the other threads. Thanks.