lg phone Starts on recovery mode automatically i try to update my android version using lg software update center and after downloading updates ,i tap on install.
but after my phone restarts to install updates it goes into recovery mode,
and with rebooting system again automatically goes to recovery mode.
how can i fix it?

My phone was rooted and twrp was installed on it.

i restore my system backup to fix it.
but it doesn't make it better.
please help!!!
When you root your phone or installs TWRP you give up on Android updates. Those two things don't work together because when you root you change the system image, and to install updates you need to have stock recovery too. So download latest firmware and flash it on your device (TWRP and root will be lost).