TWRP 2.7.8.1 problem!!!!

my device is G920FD dual sim

after installing TWRP 2.7.8.1 vio odin mode software reboot normally

when i restart to revovery fo 1st time it opens normally

if i try to reboot to system it keeps restarting after samsung logo shows on screen

i opened download mode to flash stock rom to solve that but this delete custom recovery

i really need to install that recovery to install custom rom as i have annoying sound problems with stock rom