that error code -2103F, appears when your computer attempts to use Internet Recovery (not simple on-disk local Recovery) and fails because the requirements for your Wi-Fi network are not met. This may mean your boot drive is not responding.
To successfully use Internet Recovery, your Network-Name cannot be hidden and you must all meet all these requirements:
local Recovery System |
Internet Recovery |
WEP |
Yes |
No |
WPA/WPA2 |
Yes |
Yes |
WPA-Enterprise |
Yes |
No |
PPPoE (where there is no router handling the PPPoE connection) |
No |
No |
Captive-Networks (where you click an "Agree" button to access the Internet) |
Yes |
No |
Proxies (where specific proxy servers must be configured in network preferences) |
No |
No |
Certificate-based authentication / 802.1x |
No |
No |
from:
OS X: About OS X Recovery - Apple Support
.