I have a pair of these I used to use with OpenWrt in good working order. More importantly i also have the original firmware backed up for those routers which is part of the OpenWrt upgrade procedure.
Let me know if you would like the new RC on it or the stable version and i'll flash them and send on and link / send the firmware too.
As they have OpenWrt preinstalled you only have to upgrade the version later yourself and dont have to crack the case and try solder on UART port leads.
As an OpenWrt router with VDSL it is ok. You can even squeeze in a AdGuardHome install if you are careful but there is limited space and ram so do not go wild putting 4million block lists into it. It WILL fall over with out of memory errors. (and its why i upgraded)
UK buyers preferred as the postage will most likely be about £5. £10 for a router.