[Solved] Entering Failsafe Mode: IP settings on windows

I am a new user trying to set up OpenWRT as an access point on my old AC1200 router. Somehow I have messed it up an now I am trying to enter Falsafe mode as described here: https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset
Since I am a windows user I have never changed my IP address before and don't know what I have to do to get on the OpenWRT interface again:

You must set your computer's ethernet port to use a static IP address in the network (valid IPs are -, subnet mask

Editing IP settings on Windows manually asks for the following points:
IP address
Subnetz prefix length (?)
Preferred DNS:
Don't know
Akternative DNS:
Don't know

Could anyone please tell me what I have to enter there to connect the PC with the openwrt device?
Thank you very much!

Use for the don't know parts.

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Gateway and DNS do not need to be set to anything, since in failsafe mode you will not be routing to the Internet. The important thing is the IP address must be within and the prefix length is 24 (which is the same thing as netmask

It's also allowed to set gateway and DNS all to, which will allow the PC to reach the Internet through the router, if the router is properly configured.

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Thank you very much! This solved my problem!