Yes, there is source code available on LG support website for all flavours of the 8.4 G Pad. I downloaded it all, I might get into kernel building. There are just too many variables for me. http://opensource.lge.com/osSch/list...LL&search=V500 It has been there even from earlier versions of KitKat (like V10C). It is still a lot of work to get a kernel for the stock ROM. I'd help in any way I can if help is needed.
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