apple.com/support -21 00F -- this is what I get on startup

MacBook Pro, V OSX won't boot.

Cmd R: progress bar gets to ~95% then freezes.

Cmd Option R: shows internet recovery starts, gets to ~5%, ticks along for about an hour then freezes.

Cmd Shift Option R: Gets to ~10% on the progress bar then freezes with the following on the screen:

apple.com/support

-21 00F

Don't find much on this error code on the site.

Can someone help?

MacBook Pro, iOS 11.3.1

Posted on Sep 4, 2018 10:52 AM

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Question marked as ⚠️ Top-ranking reply

Posted on Sep 4, 2018 11:52 AM

In Internet Recovery and Internet Diagnostics, these low negative thousands error messages indicate that your provided Wi-Fi Network is inadequate in some fashion, and cannot be used (for this purpose) in its current state.


Common problems include:

Hidden Network-name

required use of a proxy server to get Internet access

required use of a login page to get Internet access

Use of a login server or certificate to get Internet access

Use of PPPoE in the Mac to get Internet access (typically only applies to DSL)

Use of Fixed IP address rather than good old DHCP

Variance of the time by more than five minutes

Failure of Router to provide workable DNS server addresses, or providing 0.0.0.0 [may produce -2002f]


If you have an Ethernet port, you may in some cases be able to move your Mac close to the Router and connect to the Router using Ethernet.


The higher the number, the more obscure the problem.


Also, make certain the Date&Time and Time Zone are correct within 5 minutes.

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Question marked as ⚠️ Top-ranking reply

Sep 4, 2018 11:52 AM in response to KatLeffler

In Internet Recovery and Internet Diagnostics, these low negative thousands error messages indicate that your provided Wi-Fi Network is inadequate in some fashion, and cannot be used (for this purpose) in its current state.


Common problems include:

Hidden Network-name

required use of a proxy server to get Internet access

required use of a login page to get Internet access

Use of a login server or certificate to get Internet access

Use of PPPoE in the Mac to get Internet access (typically only applies to DSL)

Use of Fixed IP address rather than good old DHCP

Variance of the time by more than five minutes

Failure of Router to provide workable DNS server addresses, or providing 0.0.0.0 [may produce -2002f]


If you have an Ethernet port, you may in some cases be able to move your Mac close to the Router and connect to the Router using Ethernet.


The higher the number, the more obscure the problem.


Also, make certain the Date&Time and Time Zone are correct within 5 minutes.

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apple.com/support -21 00F -- this is what I get on startup

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