Upgrade error FLM03B (Firmware 345)

I’m unable to update my Flukso FLM03B. Model: FLM03B, firmware: 345.

The remote/automatic upgrade does not complete. After checking on the device, it looks like the upgrade script download fails.

  1. wget: not an http or ftp url: <a href="https://www.flukso.net/files/upgrade/upgrade.381<br />
  2. chmod:" title="https://www.flukso.net/files/upgrade/upgrade.381<br />
  3. chmod:">https://www.flukso.net/files/upgrade/upgrade.381<br />
  4. chmod:</a> /tmp/upgrade.381: No such file or directory
  5. /bin/sh: /tmp/upgrade.381: not found
  6. rm: can't remove '/tmp/upgrade.381': No such file or directory

Is there an official HTTP mirror/URL for the upgrade scripts ?
If not, what is the recommended/supported way to update an FLM03B running FW 345 (firmware image, alternate procedure, etc.)?