Post not yet marked as solved
Click to stop watching this thread.
You have stopped watching this post. Click to start watching again.
contentPostList.repliesup-voted.tooltip
This is what worked for me. Months ago I installed Catalina b2 in its own apfs container allowing for a Mojave/Catalina dual boot and later deleted it. I then reset the SMC and PRAM due to unrelated issues which re-enabled SIP and no booting from an external drive. I wanted to do a clean reinstall of Mojave but couldn’t boot from usb and couldn’t access recovery. I was getting error 9000F. I removed my MBP from my iCloud account but still got 9000F. Ended up resetting the PRAM twice and was greeted with macos recovery to install Catalina beta.