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Why cant I update to the latest os on the MacBook

will upgrading key component like hard drive and ram fix this problem im having

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While upgrading your RAM and storage can get you more performance out of your system, it won’t really help you run newer versions of the macOS.

There are different issues at play here! First Apple’s OS support is set to High Sierra 10.13.x as the highest. Thats not to say you can’t force newer OS’s using hacks! But there are limitations here as many of the benefits of the newer OS’s require hardware to support them! While Apple offered support for High Sierra I personally don’t recommend it on this series! Again the issue is hardware! Your system uses a SATA drive interface which is not as powerful as a PCI interface used in the Retina series. The file system was also altered to APFS starting with High Sierra when a SSD was present. Which is why you need to stick with Sierra as APFS is too chatty unlike HFS+

So unless you have something that requires a newer OS I would stick with Sierra or High Sierra if you must.

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It’s seems like I do need higher like Catalina because the desktop works for what I need it to do but I also need to be mobile so don’t know if upgrading laptop is better option or just getting a hole new one

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If you need Catalina as you have an app on your desktop that requires it and you want to mimic your setup on a portable your best direction here is to wait! Apple next week is expected to introduce new Apple Silicon based Mac's. I would see if one of them offers what you need.

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No. Apple never released a build of the latest macOS for your model.

There are ways to patch new macOS to let it install on older macs, but newer versions were never designed for this, they expect hardware features that weren’t present on older macs and will not work reliably.

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