Restore Mikrotik after Openwrt

Below is my solution:
1) I installed the «rbcfg» package on routerboard rb912uag-2hpnd with openwrt installed.
2) By terminal:

root@OpenWrt:~#rbcfg set boot_protocol bootp

root@OpenWrt:~#rbcfg set boot_device ethnand

root@OpenWrt:~#rbcfg apply

3) Open Netinstall and reboot routerboard. Now netinstall sees routerboard and you can install RouterO