Replaced the display, some apps don't work anymore.

Hello.

In general, I think this is a good question about the replacement of the display about any kind of mobile phone.

I was recovering some data from this old well-working Nokia Lumia 820 (people should always recover one's memories) and I broke the display accidentally.

I have replaced the display. The display and the digitizer are working properly, some apps are working but someone else aren't working anymore.

It is necessary to take some precautions when replacing a hardware component. In fact, the hardware could work properly but something could happened to the software, that I don't know.

Moreover, the mobile phone keeps only the date and the hour predefined in the firmware, each time I switch off and on again the phone.