Hello all. I previously installed 15.3.2 on my MacBook Pro mid-2012 13" and boot directly from the SSD, and now I'm trying to update to 15.4. When I press and hold the option key, I get the options to choose if I want to boot the EFI on the USB which I select, but then it boots me into the SSD version of 15.3.2 completely skipping the installer. When I select the installer directly, it gives me the prohibitory sign as expected. Any suggestions on what to do?
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