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Released on July 21, 2011. Core i5 or Core i7 Processor. Thunderbolt. This unit is also used to run the Mac mini Server configuration.

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How can I upgrade the operating system to Catalina

How can I update the ram and SSD and what ones do I need and how do I updated to Catalina

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Technically this system only supports upto macOS High Sierra (10.13.6)

While there are a few hacks which you could use I really don’t recommend them if you are dependent on this system for school or work. You also won’t get many of the major features as there is dependency within the hardware. I recommend you stick the either Sierra or High Sierra.

Here’s the guide to upgrade your RAM - Mac mini Mid 2011 RAM Replacement

To add a SSD I would add it as a second drive following this guide - Installing Mac mini Mid 2011 Dual Hard Drive Kit

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Mac mini Mid 2011 RAM Replacement

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5 - 10 minutes

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Installing Mac mini Mid 2011 Dual Hard Drive Kit

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2 - 4 hours

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