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[crgbt]

@s0m3f00l @Boboki

Looks like your suggestions have worked for me on my SG-3100, thanks for your help.

[xirus]

@Boboki thanks, your method worked for me! With a slight variation: in the last step I just pressed 'upgrade' in the Gui, instead of going back to command prompt.

[Boboki]

@xirus Awesome, that is good to know as well!

[macterminal]

Reconecting the WAN Port solves the problem.
I verified this on a Netgate 6100 and a Netgate 2100.