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Apple iMac (21.5-inch, Late 2013) Silver, 8GB RAM, 256GB SSD MacOS Catalina (10.15) Used (Grade A) - One Bite Technology - St. Albert
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Apple addresses macOS Big Sur upgrade issues impacting 2013 and 2014 MacBook Pro models | AppleInsider
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iMac Late 2009 - Bluetooth and USB keyboard and mouse do not work on Big Sur installation screen · Issue #43 · barrykn/big-sur-micropatcher · GitHub
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