I just want to check to not give up too soon:
I have a Speedport 921v. It has no use at the moment for me. So getting to know openwrt would give the device a reason to be.
Reading this (Lantiq XRX200 Easybox 904xDSL and Speedport W 921v build) I had the hope that there would be an easy way to install a working version of OpenWrt on this device - but all the files there seem to be offline.
The Table of Hardware lists this device, but doesn't offer a factory image.
So my only chance would be to understand and follow the guide given here?