To clarify you need to select FW file and press upgrade to downgrade. Have you tested with another PC?
I did some research. You have right, I dont know why but on other PC reboot with fw 1.4 is working.
Diffrent is:
- at one pc when I click "reboot": first is message "rebooting", then "receiving" and page refresh but there is no "network cable disconnected" at pc
- at second pc when I click "reboot": first is message "rebooting", "network cable disconnected" message at pc, then "receiving" and then "rebooted"
Both pc's are with Windows XP, kaspersky, tested on FF/IE, one has sp3 and second sp2 (so its main diffrent).
I cant check it on linux because all my linux machines are only text based console.