WN2000RPT - V3 - Can't open hidden dhcp server page- why ?

good evening gents,

I own a wn2000rpt V1, that I use to bridge the signal from my 4G hotspot. it means that I can activate the dhcp server on the WN2000RPT to connect more than 5 wifi device to the internet (my 4 hotspot dhcp is limited to 5) and that I can also connect computers to the internet via a physical network (rj45)

everything works fine, and I was able to enable the dhcp server on the wn2000rpt v1 with a proper IP range, which means that I would lose the wifi connection..

Anyway, I wanted to reproduce the exact same thing at one of my relatives.

Same 4G Hotspot. I bought another wn2000rpt, and this time it came as a V3

I did configure everything and it works, except that I am unable to open the hidden dhcp server page to set it up.

after logging in the http://www.mywifiext.net/ page, I can access all my setting etc..

but when I type this http://www.mywifiext.net/cgi-bin/hidden_dhcpd.html to access the hidden page, chrome tells me that the site/page cannot be found.

Internet explorer tells me the page does not exist.

Anyone know why this is happening. I remember that the first day I set my own wn2000rpt (v1) it would do the same, and then it worked the second day... but i dont know or remember what changed exactly.

Do you know what could be a reason for the http://www.mywifiext.net/cgi-bin/hidden_dhcpd.html page not to show up, when the http://www.mywifiext.net/ setting page comes up fine and that I can log in ?

Your help is greatly appreciated. Thanks a lot !

ps:im in switzerland, if that makes any difference