macbook air 2017 doesn't reboot with shift cmd +R
On my Macbook Air 2017 I am unable to reinstall the original system which came with the machine.ù
Pressing Shift+COMMAND+R simply reboots the machine while (with ethernet connected and working) pressing COMMAND+R takes me to the internet for the standard functions
Is the SHIFT+COMMAND+R combination deprecated?
If yes how can I reinstall 10.12.5 (SIERRA fro the internet?)
MacBook Air