I have a 2018 Mac Mini. I foolishly decided to create a new APFS volume on my startup drive to test out Catalina. I thought I would be safe with APFS volumes, since I wasn't updating my actual Mojave startup volume. Furthermore, I have two additional clones of my Mojave startup drive and a Time Machine backup on my Synology. So I thought I was safe to mess around with a clean install of Catalina. Anyway, what I didn't realize was that it was going to replace my internal SSD's recovery partition with the Catalina version -- even thought I ended up deleting the Catalina APFS volume. And by the time I realized that was the case, it seemed Carbon Copy Cloner has also cloned over the Catalina beta recovery partition. While my Mojave startup volume is generally operating ok, I simply cannot update to 10.14.6. The problems are: I always get the Cannot Verify error if I try to do a normal update from system utilities I cannot start from the recovery volume to do the update, because it tries to install Catalina instead I have tried to use a install macOS thumb drive with Mojave... no luck, and cannot verify Internet Recovery either ends in a -9000f error or just never actually loads I have wiped the startup drive completely to try to do a fresh install from Internet Recovery or otherwise, and that fails too I CAN clone back to my startup drive to have a working copy of 10.14.5, but have no ability to update After hours, both on my own and with senior level technicians at Apple, I'm just stuck. Any ideas? It feels like I need to get into the regular recovery partition, but either I cannot do that when the drive is clean, or it otherwise goes to the Catalina installer. Very frustrating! And a key lesson learned that APFS volumes for beta system software -- while seemingly safe and elegant -- will mess with other things! Thanks for any advice!