Currently running 24.8.3 and have copied it to the eMMC, working fine on both the µSD image and eMMC.
(On the Rock-Pi-S, if you have a bootable image on the µSD card, it boots from that. If not, it boots from the eMMC.)
Today, running from the µSD, I did an apt update and apt upgrade, and it updated a few packages (here's the list):
# apt list --upgradeable
Listing... Done
armbian-config/unknown 25.2.0-trunk.154.1212.080011 all [upgradable from: 24.11.1]
armbian-firmware/