Problem is with missing adaptation-common repo.
Here’s the fix, root privs required:
devel-su
ssu ar adaptation-common https://releases.jolla.com/releases/4.3.0.12/jolla-hw/adaptation-common/armv7hl/
ssu ur
zypper ref
zypper dup
Update:
You may need to run first, if getting error messages on ssu ar:
rm -f /var/cache/ssu/features.ini
ssu ur
Update 2:
If you don’t have zypper installed (root privs required):
pkcon install zypper