How can i solve it. I can not connect my mikrotik now.
You mean after you downloaded and upgraded unit is not working? Probably something went wrong during upgrade and there is no OS so you need to upload firmware thru Netinstall
https://wiki.mikrotik.com/wiki/Manual:Netinstall
But use 192.168.88.2 not 192.168.1.2 in Wiki there is mistake.