Rooting LG Optimus Net (LGL45C) Alternative Method?

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http://androidforums.com – Hey I've wanted to root my mom's Android for a while now so I could remove the message that always pops up asking to register the device with the mobile provider. I had her buy it on clearance at Target so she could use it at home on WiFi, since it didn't have a contract and therefore she wouldn't have to buy service to go with it. Now, I need to root it because the touchscreen driver has somehow become corrupted. Is there any way to install this new OS or rooting program without using the method with enabled USB debuging? I can't get past the unlock screen, and I learned recently tha (General)