Mac OS Big Sur
Any time frame for when Big Sur will be available for iMac 21.5 Late 2013 model?
iMac 21.5″, macOS 10.15
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Your Mac does not have the hardware necessary to run Big Sur. You're at the furthers you can go with macOS systems.
Time to start saving up for a new Mac. You can see what your current iMac is worth fore a trade in: Apple Trade-In.
