Hi. I am new on that forum. I am try boot this device. On original firmware system work bad.
I have one question. Can i am upload data from SPI FlashROM, mount it like drive, and edit system files, and pull changes back to this chip. I am not sure, guess its possible. Thanks.
And if u know how i can create custom openwrt for this it could be helpful, but default uploader checking something about firmware and fails. Maybee i can boot jtag.

image.ibb.co/kMUG7b/FMOYj5co_SI.jpg
image.ibb.co/h73b7b/kc4g_Wq_LWw_F8.jpg

And i am found this: opensource.lge.com/osList/list?m=Mc024
But compile fails, guess missed some files.
LG says: This site is just for providing source codes of FOSS(Free and Open Source Software) we have used in our product.
I am not sure its for this device

Look near the yellow RJ45 jack
There is some 4 pin unsoldered header.
This look like some serial line.

Try to figure out which pins are GND, TX, RX and maybe 3,3 Volts.

Use some 4 pin USB to serial adapter.

NOTE/IMPORTANT
Don't attach the red wire from the usb serial adapter.
There are 5 Volts which will damage your board.