Originally Posted by lukatico
I have installed the USB DRIVER from the LG website, but still have the "error: device not found" message. where did you obtained the drivers?
I thought so too before, but you still haven't installed the ADB driver for your LG
Go to this link, and follow the instructions to install the drivers
after installing the driver for ADB, connect phone and go to custom recovery
then do this command using ADB
adb push (name of rom.zip) /sdcard/0
BTW you should have the rom.zip inside the adb folder to make the command work
there lots of guides on how to use the adb push/pull function, just search the internet and refer to those.