If you see nothing until you get to login, it's not. If you can see the boot screen, it's flashed. You could then test by just swapping in the card & booting up. From memory, the HD5770 takes a single 6-pin, but there should be a second cable already in situ. If it's 8-pin you'll need to get adaptors. My card is flashed, so some of these precautions are learned from others' experience, not my own.įirst of all, to be safe - it you have File Vault enabled, disable it & wait for it to finish decrypting before moving on.Īnother thing to check is whether your new card is 6-pin or 8-pin. I'm assuming the card you have is not specifically Mac-flashed. you never know when something might go wrong. I would always be certain to have not only an up to date Time Machine backup, but I would also have a full clone of the working system before starting out. According to various reports around the internet, to get to Mojave there are a couple of precautions to take so you don't lock yourself out of the machine.
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