You should never download firmware from random file-sharing sites (like Mediafire or Rapidgator) for the Tenda N318. These files can contain malware. Only use official sources.
If the web interface is inaccessible:
If Tenda has completely removed the N318 from its servers:
DD-WRT: Another alternative firmware, though support is less stable on the N318 than OpenWrt.
Tenda N318 Firmware Download -
You should never download firmware from random file-sharing sites (like Mediafire or Rapidgator) for the Tenda N318. These files can contain malware. Only use official sources.
If the web interface is inaccessible:
If Tenda has completely removed the N318 from its servers:
DD-WRT: Another alternative firmware, though support is less stable on the N318 than OpenWrt.