I've been flashing my LG Optimus L7 numerous times with various Custom ROMs and now I'd like to return to the official firmware.
I've factory reset my phone, flashed the v20D official firmware with KDZ tool and then I did another factory reset. However, I've read that the factory reset only wipes /data and /cache folders (user-accessible data), while /system and /boot remains the same. The questions:
I've flashed the official firmware using the KDZ tool with the EMERGENCY phone mode. After flashing, some of the old settings remained which were gone after a factory reset. As I understand, flashing the phone with a firmware doesn't wipe /system or /boot, right? Therefore some of the files from the previous custom ROM remain.
What should I do now to fully clean my phone from all custom ROMs? I've already flashed the original firmware and did several factory resets, but I know the reset doesn't touch /system and /boot, for example. How do I completely clean my phone? Is it even possible?