I had a similar problem today trying to update a manjaro image I hadn't used in a few weeks. The 2020.02 release notes suggest manually updating the mirror list. After following those instructions I was able to download all the new packages, but the kernel package fails its signature check, so I still haven't been able to update.
I was able to solve the kernel signing issue by running
I was able to solve the kernel signing issue by running
Code:
sudo pacman -Sy manjaro-arm-keyring