I can't login into just bought routers rb4011

Hi all,
I bought two mikrotik routers rb4011iGs+. RouterOS 7.8 “stable” and default IP 192.168.88.1.
When i try to login with Winbox 3.37 using default login “admin” and blank password field. I get error
“Wrong username or password”. I tried to reset one of routers but i receive same error.
What could be the problem ?

Read carefully the sticker on the device. There you will learn the parameters for logging in.

Thank you very much ! The problem is solved!

Even if you change the admin password, make sure you save that factory password somewhere. You may need it later.