And you of have reset the configuration while installation or later? Because otherwise it wont have changed anything at the configuration.
In general its always a good idea to use the latest DSL-firmware file. In Germany you have ADSL lines with ANNEX-B. In this case you have to use vr9-B-dsl.bin for example from here Howto: Updating the Lantiq XRX200 devices with latest DSL vectoring firmware - #39 by godraselti or if you dont trust this file, then download the latest 7490 firmware image on your own and extract it from there.
Most people put this firmware file into /lib/firmware of the router because there is also the old redistributable DSL-firmware file. Dont forget to configure set in the DSL-tab to use this DSL-firmware file instead of the default OpenWrt one.
Also dont forget that sometimes it could take up to 10 minutes for a sync in some cases. So be patient as long as it tries to sync.