I have the 75 inch 75PFL5604 and was just able to unlock the bootloader and such. I hadn't taken any updates before the unlock. Problem is I can't get the tv into preloader mode to dump the full firmware. It's using an MTK Soc. My next step is to possibly tear the tv apart a bit to short some pins to force it into preloader mode, at which point I should be able to dump it with Mtk Client, build a TWRP for it and have a custom recovery on my Android tv. From there I would pry want to do some sort of custom stock rom for it. What do you guys think? Anyone else have this tv and want to coop on a project?