If your ISP no longer supports the H168N, try the Wayback Machine ( web.archive.org ) with your ISP’s old support URL.
Some ISPs host community forums where official support staff post firmware. Example: Telkom Community or Whirlpool (Australia) . Only download attachments that are linked from an . zte router zxhn h168n firmware download
The file is for a different bootloader. Stop immediately. If your ISP no longer supports the H168N,