Web management interface for IG902H not accessible

We have an edge gateway IG902H which was already configured. A few days back it was powered off due to some network and infrastructure related changes at the site. Now, after connecting back to the power, it is not showing the web management interface even connecting locally to the laptop. We have tried following things at our-end 
  1. Set a static IP address:192.168.1.2 and subnet mask: 255.255.255.0 to the laptop. Please see the below screenshot.
  2. connect GE01 port to directly to the laptop
  3. Tried to access the web management interface on default gateway address (192.168.1.1) https://192.168.1.1/user/login. But it shows 'page can't be accessible.' 
  4.  Tried to power on-off a few times edge but still the same issue. 
We are referring IG902H user manual(http://manual.ig.inhandnetworks.com/_/downloads/en/latest/pdf/) to troubleshoot the issue locally but nothing worked so far.
There is a hard reset option which allows factory reset, but we haven't tried until now as we don't want to loose any configured docker containers or any other configured settings on the edge gateway. Is there any other way or configuration which can be tried.   
Could you please suggest/help on this issue. 

Your help would really be appreciated.

thanks in advance! 


Has invited:

Try opening the page using Firefox, some of the other inhand modems are giving certificate errors.  Chrome and Microsoft Edge both display page cannot be accessed but Firefox gives option to ignore the certificate errors and proceed anyways.

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