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My external card reader (ProMaster 6 in 1 USB) is not recognized by my MacBook Pro since I installed Mojave. It worked with High Sierra only a few months ago, so I know it's not the card reader or the card.
MacBook Pro 15", 10.14
It could still be the card reader or the card but try resetting the SMC.
How to reset the System Management Controller (SMC) on your Mac - Apple Support
It could still be the card reader or the card but try resetting the SMC.
How to reset the System Management Controller (SMC) on your Mac - Apple Support
ProMaster External Card Reader
