Rooted phone, turnoff to access boot loader, wnot turn on, only goes to dwnld mode

[Jaklewlew]

I was trying to root my old lg optumus g BC I am interested in learning how all this works, when I reset to see if the boot loader was open BC I just got root access, phone would not boot. Stays on lg screen. I can only access download mode. Need help in where to go from here. I have downloaded Lg flash tool, but cannot find any DLL files to flash.
Under my free gee files there are Att backups, but I don't know what I can do with them?
Please help!

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