ASU testing on this version was much more stable that -rc4, the builds were fast and clean.
If you encounter issues with ASU upgrades, please report them on the respective client threads:
Rockchip target
Is available in -rc5, the bug that cause it to not build for -rc4 has been long fixed.
The only known issue at present is a transient one: the imx/cortexa9 and zynq/generic targets don't have their ASU docker containers yet, so it might be a few hours until these devices appear in any ASU client.
Well, they built a lot faster than I expected, looks like they jumped the head of the queue and bypassed the 30 snapshots ahead of them, and are now tested and available.