It doesn’t work:
[user@dom0 ~]$ sudo qubes-dom0-update kernel-4.19.163
Using sys-whonix as UpdateVM to download updates for Dom0; this may take some time...
fedora/metalink | 6.4 kB 00:00
fedora | 4.3 kB 00:00
fedora/primary_db | 26 MB 00:46
qubes-dom0-current | 3.8 kB 00:04
qubes-dom0-current/primary_db | 426 kB 00:02
qubes-dom0-current-testing | 3.8 kB 00:02
qubes-dom0-current-testing/primary_db | 355 kB 00:02
qubes-dom0-security-testing | 3.8 kB 00:00
qubes-dom0-security-testing/primary_db | 774 kB 00:05
qubes-dom0-unstable | 3.0 kB 00:00
qubes-dom0-unstable/primary_db | 175 kB 00:01
qubes-templates-community | 3.0 kB 00:00
qubes-templates-community/primary_db | 8.0 kB 00:00
qubes-templates-community-testing | 3.0 kB 00:00
qubes-templates-community-testing/primary_db | 4.8 kB 00:02
qubes-templates-itl | 3.0 kB 00:00
qubes-templates-itl/primary_db | 6.9 kB 00:00
qubes-templates-itl-testing | 3.0 kB 00:00
qubes-templates-itl-testing/primary_db | 5.7 kB 00:01
updates/metalink | 6.0 kB 00:00
updates | 4.7 kB 00:00
updates/primary_db | 12 MB 00:21
--> Running transaction check
---> Package kernel.x86_64 1000:4.19.163-1.pvops.qubes will be installed
--> Finished Dependency Resolution
kernel-4.19.163-1.pvops.qu 97% [=============kernel-4.19.163-1.pvops.qu 97% [=============kernel-4.19.163-1.pvops.qu 97% [=============kernel-4.19.163-1.pvops.qu 97% [=============kernel-4kernel-4.19.163-1.pvops.qubes.x86_64.rpm | 49 MB 04:31
Successfully verified /var/lib/qubes/dom0-updates/packages/kernel-4.19.163-1.pvops.qubes.x86_64.rpm
Qubes OS Repository for Dom0 72 MB/s | 73 kB 00:00
No package kernel-4.19.163 available.
Error: Unable to find a match.
[user@dom0 ~]$ sudo dnf downgrade kernel-4.19.163
Qubes OS Repository for Dom0 72 MB/s | 73 kB 00:00
Error: conflicting requests
(try to add '--allowerasing' to command line to replace conflicting packages)