Nextbook Next7P12-8G soft bricked help please? topic

So I goofed around with trying to root my Nextbook Next7P12-8G November 2012 model. The serial number is like YFG112

My nextbook turns on and shows the Nextbook logo and stuff but after all that when android should be loaded up its just a black screen.. A friend told me I soft bricked my tablet and I need a stock rom to flash it on my tablet to fix it.. Anybody here happen to know where I can get a stock rom for this tablet at? I like seriously need a stock rom. Thanks in advance