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It needs to be enabled in the kernel. More then likely, you just need to fix the USB init file as it worked fine in SOTARD and that used the same zImage that CM does (roughly). It is on the bug tracker, but I've been busy on side projects (TWRP).How to enable diagnostic mode in lg spectrum? Want to flash another carrier with cdma workshop but enabling USB debugging could not help to read or write on phone. Seek your help..........
You can get to an otherwise hidden menu by dialing *#*#4636#*#* not sure if this will let you do what you want or not, be careful.