My SXT LTE has internet issues .

I can connect directly to my pc and i can see the device has a vodafone signal.

but if i try to do a firmware update it says DNS failed wont check.

the PC will also not connect to the internet.

What do i need to do to configure DNS ? and with what info ?

First, read documentation: https://wiki.mikrotik.com/wiki/Manual:Interface/LTE
Check if lte1 is running ? You receive IP from ISP (WinBox IP Address)?
You enter APN ?

Give us more details.