Just download stock firmware for u tab and flash it with Odin. After it done, reboot directly into recovery and wipe data/factorey reset. (this will delete leftover root files)
Which stock firmware to flash, is up to u and it doesnt matter (WiFi version). If LTE, choose right region for LTE bands.
Before begin, its best also to uninstall KIES, since it can interrupt with Odin and just need Samsung USB driver installed. Also dont change anything in Odin, u just need to load firmware with PDA button and then reay to go.
US = XAR
SM-P600 WiFi:
Firmware archive | Samsung Updates
SM-P605 LTE:
Firmware archive | Samsung Updates
Flash stock firmware guide:
http://forums.androidcentral.com/ambassador-guides-tips-how-tos/300296-guide-samsung-how-flash-stock-rom-via-odin.html