Icarus E645BK appears offline from within apps

I haven't used my Icarus Reader (model E654BK, Android version 4.2.2) since my last holiday past August. Back then all worked fine but I guess with the company gone a few things might change.
Now when I try to access the internet from within an app like 'Google Play Store' or 'Amazon Kindle' the device appears offline showing something similar to: " Server could not be reached"
When using the browser I can access the internet. However, the reader is showing me multiple security/ certificate warnings for any site.
I have already change the settings of the browser to ignore security warnings - that did not help from within the apps though. As a result I cannot buy or download new books :(

Update: I seem to have found the problem. Since last using the device the time and data have been changed to a random date in 2015. After correcting these all seems to work again.