What’s -2002f

If your Mac starts up to a question mark

A folder with a flashing question mark means that your startup disk is no longer available or doesn't contain a working Mac operating system.

If the question mark appears only momentarily before your Mac starts up normally:

1. Reset NVRAM.
2. Make sure that your preferred startup disk is selected in Startup Disk preferences.

If the question mark persists, follow these steps:

1. Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
2. Turn on your Mac and immediately press and hold Command (⌘) and R to start up from macOS Recovery.
3. While in macOS Recovery, use Disk Utility to repair your startup disk.
4. If Disk Utility found no errors or repaired all errors, reinstall macOS.
5. If you still need help, please contact Apple Support.

Follow these guidelines during installation:

• If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
• If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
• If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
• 
  

The error code  -2002f means there is no functional and active Internet Connection

My notes on 2002f...

error "2002f" was reported when i had DHCP forwarder enabled on the router.

the solution was simple:

1 - I had to set the static DNS servers to google's DNS IP addresses instead of openDNS.

2 - I Had to enable "DNSmasq for DHCP" & "DNSmasq for DNS"

The recovery worked as expected it took around 20 minutes to download the initial recovery utility, then another 4 Hours to download OSX lion.

The flashing folder means the MacBook can’t find an OS to boot to (either it’s been wiped or your SSD died) and so you need to install in OS. Since you posted in the macOS High Sierra forum, you can find an installer if you Google how to get old OS X on apple.com.