• Apple Mac Pro Me253ll A
• Me253ll A Specs

I recently had to re-install the original OS from the discs that came with my MacBook Pro. This installed Snow Leopard and software updates have taken it to 10.6.8

Apple Mac Pro Me253ll A

Feb 13, 2018  I recently had to re-install the original OS from the discs that came with my MacBook Pro. This installed Snow Leopard and software updates have taken it to 10.6.8. However it refuses to upgrade to Lion, Mountain Lion or Mavericks. (I've tried them all a few times). I have repaired permissions and checked the HD is OK (which it is). Apple Footer. Trade‑in value based on 2019 15-inch MacBook Pro. Trade‑in values will vary based on the condition, year, and configuration of your trade‑in device. You must be at least 18 years old to be eligible to trade in for credit or for an Apple Store Gift Card. May 26, 2020  If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.

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However it refuses to upgrade to Lion, Mountain Lion or Mavericks. (I've tried them all a few times).

I have repaired permissions and checked the HD is OK (which it is).

Each time I try to upgrade it takes me to disk utilities. The only way out is to quit and restart in 10.6.8

Me253ll A Specs

Does anyone have a tip on how I can upgrade again? It used to run OS X Sierra quite happily.

MacBook Pro, macOS Sierra (10.12.3)

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