Hi Alvin,
Me too i have this tablet Optimus Pad L-06C and also the same problem.
There seems to be a problem of Build
Older versions (because I have multiple tablets) including one of these are Android 3.0 etc ....
And the problem just updating .Ja'vais precisely the same message you on an Acer tablet 3.0, 2 tabelltes Asus ditto 3.0, L-co6d fudjisu and I managed to make upate, these 4 Android tablets are now 4.03 Sandwich .Even though the former fudjitsu fonctione in this build!
But then to find the update file for our LG optimus 4.03, outch not gonna be obvious! I'm still looking this damn file!
I said it's good to go, LG American, it'll be easy ........ You bet !!!!
a real problem to find on the net.
So I feel obligee to make a call, If you have this tablet Optimus Pad L-06C not and that you went to android 4.0.
Tell us please, your solution and above or download the firmware 4.0 or higher
Thank you !