Open terminal
sudo nvram recovery-boot-mode=unused
sudo shutdown -r now
Once in recovery mode run following commands in Utilities > Terminal
csrutil disable
nvram -d recovery-boot-mode
shutdown -r now
Open terminal
sudo nvram recovery-boot-mode=unused
sudo shutdown -r now
Once in recovery mode run following commands in Utilities > Terminal
csrutil disable
nvram -d recovery-boot-mode
shutdown -r now