I'm not sure, but I guess I did update it, why, is that a problem?
But the fresh image that I downloaded today is also not working(and I didn't update it). When I extract it using gunzip and flash it onto a 16gb sd card, and insert it into eb2, it simply doesn't work. I mean the green light besides the micro usb port doesn't get turned on, besides the lights on the ethernet port are also off. However when I use ordinary debian downloaded from raspberry pi org, it works perfectly fine with eb2. So what shall I do in this situation?