How to format (not factory reset) android?

[Guilherme Girotto]

I did root on my galaxy s5, but i have some problems about uninstalling some phone apps.
Now, how do i reinstall the entire system? Because if i only factory reset the phone, the apps still with problems.

 

[Rukbat]

Reflash the ROM. See [Samsung] How to flash Stock ROM via ODIN.