Did you allready succed to mine with your Zig Z1 in the past?
If not, it's probable your pool information that is not good.

On the usb you have everything, you have a part to boot your miner and also you have the firmware on it.
In my case I was not able to boot, so I had follow the procedure to make a new usb key. So I bought a new 16 Gig usb key. And I did what you have at this link:  https://drive.google.com/drive/folders/1Y1YXEgEnIFVnmzmD7PaTAMrVEDikTrfR ( the new image at this link put a static ip adress that is 192.168.1.100)

What do you mean by modem interface, do you mean to connect on my router and check the ip adress ?
Thank

Hello,

I have my Zig Z1 since middle of october 2018.
I have a problem with my Zig Z1.
About 2 weeks ago, I was not able to connect via internet on my Zig Z1 but it was continuing to do mining. So yesterday I decide to do power off then power on my router and my Zig Z1 but now I can not see on internet and it's not mining. I used some software to give me the list of what ip adress is on my network but I can not see my Zig Z1.

Does someone have and idea of what I can do to fix that?

Is it possible that the software on the usb key near to the ethernet cable is the problem?  (this answer was yes)

Thank-you
Daniel

UPDATE:
Finaly I succed. The usb key was not good. I bought a good 16 Gb usb key. And I have install a new image on it. I took all the information at this link: https://drive.google.com/drive/folders/1Y1YXEgEnIFVnmzmD7PaTAMrVEDikTrfR
At the beginning the ip adress is 192.168.1.100, so I had to go to my router and to be sure that is on this segment (I put mine 192.168.1.1). After I changed in the MENU of the Zig Z1 to put automatic DHCP. After that, it will connect automaticaly on any router.