How do I revert my galaxy tab 4 7.0 t237p from rooted back to stock?

[AC Question]

my friend gave me a tablet he got for his birthday. He messed around with it, but tried rooting it and sort of got it. He gave it to me but I want to go back to stock android 5.1 but can't find the firmware for it. Anyone know where I can find the stock 5.1 firmware?

 

[Rukbat]

Read [Samsung] How to flash Stock ROM via ODIN, then flash the stock ROM.