Twrp recovery mod


Hey guys im trying to flash twrp recovery mod and it works but whenever i reboot the phone into system and i try to reenter the twrp recovery i see that its gone and i have the stock recovery mod
idk why that is happening and im following the steps
1st im going to download mod
2nd connecting the phone and opening odin and hiting start
3rd after its done i go to twrp recovery mod i wipe the data and then reboot to the system.

i hope u anyone can help me.