IMPORTANT NOTE :
- Do not upgrade directly from 1.0.5 (and earlier) to 1.4.4.
- Due to differences in the Web UI and functionality the router MUST first be upgraded to at least 18.104.22.168 prior to upgrading to 1.4.4.
- Upgrade your router to Version 22.214.171.124 or later first, and afterwards upgrade the router to Version 1.4.4
Check out the original post from DrayTek HERE