Hello everybody! I have the Samsung Galaxy Tab of 7 inches and I am looking for the below files: PDA: P1000BUJMC PHONE: P1000BUJM2 CSC: P1000VGRJM3 to re-install it on my Tab. Also, I bought the same Tab with my Aunt. Can I take these files from her Tab? How I can find them? Which is the step by step guide about it? And something else: what is the difference between stock and custom firmware?