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mickybovars Author

Level 1

17 points

Big Sur OS X

I have a late 2013 iMac but use an external SSD boot and store drive. Trying to update to Big Sur, app store says it can't find it. A security update keeps indicating request to be updated, but on start up it tries to go back to the internal old mac drive instead of the boot up ssd. I can't write code! It wasn't a problem last year when I updated to Catalina.

NVIDIA GeForce GT 750M 1 GB

2.9 GHz Quad-Core Intel Core i5

16 GB 1600 MHz DDR3

Catalina 10.15.7 (19H15)

iMac Line (2012 and Later)

Posted on Dec 21, 2020 7:09 AM

Top-ranking reply

rkaufmann87

Level 10

144,120 points

Posted on Dec 21, 2020 7:12 AM

Big Sur requires a 2014 or later iMac, your 2013 is at the end of the road with Catalina 10.15.7.

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Big Sur OS X

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