I bought LG G7 from ebay in early 2019. Its screen shows that the model is G710ULM with IMEI 354991091842692. Currently, its firmware is Android 8.0. So, I tried to update it by using LG UP with several KDZ files. But, LG Up message is as follows. Finally, they failed.
Error: _checkCrossDL Fail
Phone = LM-G710ULM, KDZ
For your information, a back side of my device has a sticker of LG-G710PM, MEID D: 089401370501589865. It is different from what its screen show in phone information. I don't know what is a problem.
I want to upgrade its firmware into Android 9 or 10. Please help me.