Please your help.

[strawb]

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?

 

[hdmp4]

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.

What did you do?