OpenConfig plugin on Palo Alto FWs - how to delete it

I ran into an interesting problem recently - one of the firewalls I manage had to be upgraded, but the problem immediately showed up when I tried doing an image upgrade:

I went to Device -> Plugins and there was the perpetrator openconfig-2.0.0 plugin that was installed. I tried removing the config, nothing, wouldn't budge. Then I tried to uninstall it, again, wouldn't budge. I don't even remember when I installed the damn plugin, if I even did, and I wasn't very keen on the idea of nuking the firewall and starting from scratch, so I thought - what if I try to download a previous version of the plugin instead?

So I did just that - if it doesn't work from the GUI, download it manually from the support portal and upload it to the firewall.

From there, I was able to install the new plugin and consequently, disable the old one. After that, I deleted the old plugin, and since the new plugin wasn't configured, I uninstalled it as well. Once uninstalled, I was able to remove it by clicking on 'Delete' and the nightmare was over. After that, I was able to continue with the software upgrade on the firewall as planned.