Check your Bluetooth once your Mac boots up. ![]() It will look like your computer is restarting again, but that's the two RAM types resetting. If you're good to go, boot up your Mac, but as soon as you turn it on, press the P, R, Command, and Option keys together. To do this, you'll need an external wired (not Bluetooth, obviously) keyboard. ![]() The idea is to purge any previous data left over after you moved to macOS 10.15 Catalina. This one's definitely not for newbies, but if you're confident, you can try it.
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