Hello,
here are my relevant files for download.
https://vadnet.eu/ftp/ttn/etc.zip
maybe try v3 first. I had switched from v2 to v3 on TTN with the firmware update at Kerlink.
TTN Server:
eu1.cloud.thethings.network v3
router.eu.thethings.network v2
Links to this that I found at Kerlink: