Aqui encontramos muita coisa: ROM, Kernels, tutoriais para root e desbloquear o bootloader:
http://www.androidpt.com/index.php?/topic/45229-lg-optimus-g-e975-romskernelmodsroot/
http://www.androidpt.com/index.php?/topic/45229-lg-optimus-g-e975-romskernelmodsroot/