Ive screwed up my phone.

I played around with the build.prop file and now it wont boot.

Ive learned how to use SDK and ADB, but even with the computer detecting the device and all correct drivers installed (the device manager even lists the device when its in fastboot mode)

I cant get ADB or Fastboot to see the device. The only mode I can use it fastboot, when I try to boot normally, it just loops.

I have a backup of my origional build.prop file, but I cant access the system directory in the phones root dir.

What can I do?