Problem with login or password

Hello,
Problem with Routerboard SXT lite2.
master3 antenna connected to the modem. I find it, (good MAC address).
Winbox finds the 2 antennas Master3 and Slave3.
login: admin
password: n / a (no password)
as indicated in the attached leaflet.
Can not login because login or password wrong !!!
Can someone help me?
Sorry for my English, I’m french
thank you in advance

Have you setup and configured them?
If so, take a reset and start over.

Hello,
Thank you for your reply.
I can not configure them since Winbox does not want to connect.
How can I take a reset?

Unplug device from power, press and hold the button right after applying power and wait until the USER LED starts flashing. Now release the button to clear configuration.

Thank you, it’s ok