@muggelmaniac There is already an open issue on this, you can reinforce it with your testimonial:
https://gitlab.com/recalbox/recalbox/-/issues/1415

@oak-leaves https://forum.recalbox.com/topic/20068/aide-pour-la-migration-d-une-image-recalbox-de-raspberry-pi-3-b-vers-3-b

Merci pour l'info, finalement ça a fonctionné avec la seconde carte SD et j'ai récupéré toute ma config d'avant. Je craignais de devoir tout reparamétrer.
Merci pour l'entraide 😉
A bientôt !

@bautidj it is not possible to upgrade from 4.0, simple as that. reinstall from fresh

Guyz, please just stop that 4.1 madness, trying to find an unstable (which is pretty outdated by now) at all cost

@NightShadowPT no you can't. That's why we do recommend people unfamiliar with recalbox internals to try it on a a spare SD.

For the sound, you just have to force it at each reboot, this Ill be solved at the next update

@Bowzer-Mike then you can only backup through network unless you have Linux

i can only answer for the 4.1 upgrade : it will be a regular OTA, not like the jump from 3.3 -> 4.0

I don't think it should bother your dual boot, but you'd better get the confirmation from Matt

Yes, this was exactly what I was concerned about, thanks!

I use a 64GB card.  To use the whole card I did the following: Use 'MiniTool Partition Wizard Free' (Windows) Delete all partitions on the card. Create a new partition selecting 'Primary' and 'Fat32'. You then have a 64GB (or there abouts) Fat32 partition and can copy the Recalbox files onto it. When Recalbox has installed you should have 57GB of free space for your Roms.