Absolutely should be worth following through. If a very old build even if early 1.0.8 firmware installed may be a victim of cert that expired some years back requiring update.
If GW registered on TTN V3 from prior times then simply follow docs linked below and grab (stable) firmware update and an SD card and follow upgrade process, and after power cycle should connect. If going back to old TTN V2 prior to sunset then simply log into your TTN account, add the GW in new console ( The Things Network Console ) and complete the firmware update as above and you should see all running well after a short period whilst GW configures and updates……any specific issues come back here with detailed error messages and Forum users should be able to guide you through assuming not a hardware issue.