Can't install mac OS updates!
I have a MacBook Pro 2018 model and am unable to update it to the new macos. I am currently running Mojave 10.14.6 and can't update to catalina or any of the newer versions.
I have tried to do it in recovery mode, safe mode, recover via the internet, using a usb as the startup disk, repaired the disk i disk utility, i have wiped the disk to do a clean install and reinstalled macos and so on. The computer is able to download the installer but will always fail at the end of installation.
When I try to use a USB key to install, I end up with a dialog saying "A software update is required to use this startup disk" with the options 'Update' or 'set a new Startup Disk'. When I click 'Update', it goes through the motions and then fails and saying "an error occured while installing" or something like that.
Please can somebody help me, I don't know what else to try.
MacBook Pro 13″, macOS 10.14