2011 Macbook air 2 disk erase

Try using Internet Recovery Mode using Command + Option + R since it may allow you to access a more recent version of macOS. Older versions of macOS seem to have problems downloading these days.

Try connecting your MBAir directly to the router using an Ethernet cable for a more reliable connection which bypasses any WiFi issues. You will need to use either a Thunderbolt to Ethernet Adapter or an USB to Ethernet Adapter. The Thunderbolt adapter is recommended for a faster connection as USB is extremely slow.

Another option is to create a bootable macOS USB drive using another Mac.

https://support.apple.com/en-us/HT201372

seroj49 wrote:

How should I fix this problem Can you help me step by step

I provided all the information in my other post including links to Apple articles:

https://discussions.apple.com/thread/251180770?answerId=252356226022#252356226022

Here it is again:

Some type of network issue whether it is your computer, your WiFi connection, your home network, or the Internet is preventing you from connecting to Apple's servers. WiFi connections are more problematic and difficult to troubleshoot so connecting your computer directly to the router with an Ethernet cable is the best option for Internet Recovery Mode to work.

Internet Recovery Mode options:

https://support.apple.com/kb/HT204904

Or you can create a bootable macOS USB installer using these Apple instructions:

https://support.apple.com/en-us/HT201372

You can also try an SMC reset and PRAM reset. If your Mac allows it hold the PRAM reset for at least three chimes or a full minute so it activates several times.

SMC Reset:

https://support.apple.com/en-us/HT201295

PRAM Reset:

https://support.apple.com/HT204063

If your Mac came with an installation or restore DVD, then you can also use that to reinstall macOS.

If this doesn't help, then you will need to find a local Mac expert to assist you or take the computer to an Apple Store or an Apple Authorized Service Provider for assistance.

Personally I feel installing El Capitan from a USB installer or High Sierra from Internet Recovery Mode (Command + Option + R) would be the best (may need to connect the laptop directly to the router to avoid WiFi issues). Neither option involves an AppleID to work so it should not conflict with any Apple rules.

It is a shame Apple has made this process so difficult and confusing for users. I wish Apple would just have a single Internet Recovery Mode where all valid compatible versions of macOS were listed in a menu for a user to freely access. Unfortunately Apple is blind to the needs of its users and why a user would ever want or need to install an earlier version of macOS.

We'll have to see what the OP wants to do.

I checked this out before posting my suggestion. 10.7.5 can be installed via Internet Recovery. His particular model did not come restore disks, therefore, Apple expected one to restore via Internet. Leastwise, that was how I inferred the information.

You are correct re: Apple's documentation but once macOS is associated with an Apple ID a seller cannot legally include a copy of macOS or any software from the App Store also associated with the same Apple ID. This is part of Apple's software license. Hence, the seller needs to provide the original macOS that was factory installed because that version can be upgraded by the buyer of the used computer. Otherwise, the buy will not be able to upgrade macOS or software from the App Store. I don't know why this isn't included in the documentation for preparing a system for sale. It should be. Perhaps because it is part of the software license and Apple decided to trim it out of the other document. If the seller doesn't follow the requirement, then there will be a shocked buyer who finds out they cannot update or upgrade long after the seller is gone and forgotten.

One thing I have found out recently is that Apple no longer appears to be selling the retail DVD to install Snow Leopard. So, if you need to install Snow Leopard when you sell your old paperweight, you can't. But Lion is still available as a download, so it can be installed on those oldies that came with Snow Leopard. I don't know about earlier than Snow Leopard. You may need the restore DVDs that came with the computer. If they are missing, then I guess all you can "legally" do is toss it in the closet.

I understand, but Apple doesn't always provide a working method to install such old versions of macOS. These forums have a lot of posts showing people being unable to install the really old versions of macOS. The OP may not have any choice in the matter.

Actually Apple's document for preparing a system for sale does not mention needing to install the original OS. It only mentions reinstalling macOS. I realize at one time it was a requirement and did specifically say the part about the original OS, but the document's current form no longer suggests it.

Did your model come with a Software Restore DVD?

Internet/Network Recovery of El Capitan or Later on a Clean Disk

     If possible back up your files before proceeding.

1. Restart the computer. Immediately, at or before the chime, hold down the (Command-Option-Shift-R) keys until a globe appears.
2. The Utility Menu will appear in from 5-20 minutes. Be patient.
3. Select Disk Utility and click on the Continue button.
4. When Disk Utility loads select the target drive (out-dented entry w/type and size) from the side list.
5. Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
6. Set the partition scheme to GUID.
7. Set the Format type to APFS (SSDs, only if installing Mojave or Catalina ) or Mac OS Extended, (Journaled.)
8. Click on the Apply button, then click on the Done button when it activates.
9. Quit Disk Utility and return to the Utility Menu.
10. Select Install OS X and click on the Continue button.

This should install 10.7.5 Lion which is the version of macOS originally installed on the computer when it was new. You will need a working Wi-Fi connection.

Apple's over-protection of macOS is mainly a marketing tool for driving users of older models to upgrade their hardware. It also is tied to the removal of prior macOS versions so that we must also upgrade the OS. Unfortunately, this discourages the use of older hardware that is still working and makes their owners unhappy. But we have no choice but to live with it or change hardware.

Linux seems to work perfectly well on almost all Mac computers regardless of age. It's a good choice for the older, unsupported models.

Given the underlying topic, the question is still what to do in a case like this one. I know that once Apple shifted over to this path not long after the release of Lion, I have put my old hardware in the closet. They are hard to sell and not worth much. Can't give them away because nobody wants a really old computer.

Nevertheless, if you think you can get the OP going, then have at it.

i have MacBook Air , I restarted to Disk Utility and erased the drive and was going to reinstall MacOS but now I just getting a spinning globe on a grey screen that ends with the apple.com/support url and "-2100F" after it. Help please?

what can i do ?

Utility Menu no appear

I’m trying to restore MacBook Air it shows -2100F what should I do

See my post just before your post as it explains the issue and contains two options for you to attempt to work around the issue.

How should I fix this problem Can you help me step by step

HW,

He plans to sell the machine. Recommendation is to install the original version of macOS that came with the machine so that a new owner can place it under their Apple ID.

He cannot legally sell the machine with a version of macOS that he downloaded and installed under his Apple ID. The model he has is able to perform an Internet Recovery.

I guess I'm tired since I did not consider the AppleID App Store purchase sinceI haven't repaired anything using any macOS earlier than Yosemite in years. I can understand the App Store purchase aspect especially for the really old versions such as OSX 10.7.5 since 10.7 was a paid version of the OS and tightly tied to a user's AppleID. However, later more recent versions of macOS such as macOS 10.11 and 10.12 can be downloaded officially outside of the App Store now (although the macOS 10.12 installer is broken when it comes to making a bootable USB drive). Plus later versions of macOS have been free (I forget which version of macOS was first to be free) and not as closely tied to the AppleID when booting into local Recovery Mode like 10.7 was.

As for reinstalling macOS 10.7.5 I have seen numerous posts where users are having trouble accessing or downloading 10.7.5 specifically from Recovery Mode so it may not be possible for the OP to actually install 10.7.5. It is a shame Apple has made reinstalling older versions of macOS so difficult. If the OP is unable to install 10.7.5, then the OP may install Linux instead just to show the computer is operational. Linux would also greatly extend the life of the laptop with an up to date OS which is still receiving security updates unlike macOS (High Sierra should continue to receive security updates until at least Sept./Oct. 2020).