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I needed to reinstall macOS, so I deleted my partition and opened the Mac recovery and started downloading Sierra. Unbelievable 6 hours later, the installation was stuck and I turned my MacBook off.

Pressing the power button + Commandcommand R gives me this message:

enter image description here

I tried everything, changing my WiFi authentication type from WEP to WPA/WPA2, all boot shortcuts, resetting SMC/NVRAM.

Pressing power + CommandOption shows me the following:

enter image description here

Clicking the "..." button lets me manually input the WiFi SSID and password, but it hangs forever in the loading indicator.

I don't have another Mac to make a bootable USB stick and reinstall the OS, only Windows.

  • That looks like a connectivity issue. Can you hardwire to the Ethernet to bypass WiFi? – Allan Aug 30 '17 at 9:22
  • My Mac doesn't have a Ethernet port, it is a MBP Late 2012 Retina 13, although I can still configure the router using my phone – Vini Brasil Aug 30 '17 at 9:37
  • Try turning off encryption altogether just to get connected. – Allan Aug 30 '17 at 9:43
  • It gives me another error message that I couldn't find anything about: -1005U – Vini Brasil Aug 30 '17 at 9:48
  • From this thread - it could be that your Internet connection isn't suitable for the download...6 hours seems to confirm this. Is there an Apple store near you? – Allan Aug 30 '17 at 9:55
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I had to reinstall macOS using a USB stick. Probably the recovery partition data was corrupted and my WiFi network wasn't compatible at all for some reason.

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