Reset LG L4 E440 to original state

Hello everybody,

I've had my LG L4 for a few months now. Yesterday I tried using a DPI changer and it required a restart to complete. When It booted it, it went into a boot loop. After a few tries at starting my phone, I did a hard reset, but this didn't change a thing. Now my phone can't start. I can go into download and recovery mode but that's about it. When connected to my pc, I have to be in recovery mode, otherwise the device is unknown. I've tried accessing the build.prop in recovery mode and changing it but the system folder is read only. I can't change it with su as it times. Anything else that messes with permission is denied.

Are there any people here that have had this before and fixed it?