This is the area to clarify hardware specification if there's anything unclear from the datasheet. If the specification is software related, please ask in the related software section.

What are the maximum/minimum feeding voltage for UpSquared?

My board is UpSquared. My operating system is Ubuntu 16.04. I am using mini usb wifi
adapter, mini usb wifi adapter, SATA for a disk, and some gpio pins and 5v pins also.

In datasheet, power supply voltage is written 5 volt DC. My question is that what is the maximum and minimum limits? For example can I give 6 Volt,4 Volt,7volt? I tried to give 5.5, 5.3 Volt and there is no problem. What are the limits and what are the warnings if I give more than 5V?