update phone

Hi is there an easy why to update my phone.
the update app downloads 5.11.5 but i get the flash system.zip error on reboot.
Just wanted to update it to new version but not loose all my apps or data.
Is this possible.

my version is 5.0.2 LRX22G
miui version 7 global 5.10.22 | beta
build number is miuipro

thanks you all