Support for Easybox 904 LTE

Hi,

I'd like to flash my old EasyBox 904 xDSL with an OpenWRT but before I do that I have three questions I hope you guys can answer:

  1. Will I be able to make a bridge connection with another router? This Vodafone firmware has the WDS mode but it simply doesn't work (despite entering all necessary data WDS mode automatically turns off; maybe because it doesn't ask for a password and wants to work in an open network. Of course it's a no-go for me).
  2. If the answer for the above is 'yes' then where I can find a step-by-step guide how to flash it?
  3. Would I need to flash something else (e.g.: older version of the OpenWRT) before I flash it with the latest provided by @RENErica 5 days ago?

Thanks in advance