Right, so I got myself an AT&T LG G3 D850 from eBay refurbished and unlocked. And I'm pretty much in love with the device, but sadly I'm having some major issues with it.
First off, it absolutely refuses to switch to MTP or any other mode when connected via USB. The USB configuration seems stuck in Charging mode. I've hunted through the XDA forums again and again for a solution, but none of the ones provided have worked. I've tried several different cables, factory reset, several ROMs with no luck. If you plug the device in while it's turned on, whether to a computer or wall socket it won't even charge. In order to get it to charge I have to power off the device, turn it back on, connect the cable on the LG boot screen, and then it will charge the battery. I'd assume at this point its a bad USB port, but why would it still be charging at all if that is the case? Which leads me to believe this is related to my other problem...
I rooted the device with King Root successfully, installed TWRP manager and flashed the latest TWRP for my device. Since then I get an error screen on boot that says "Secure boot error 1003". When the device is turned off, it flashes between a screen with a battery icon that has that same error message on it, to the battery charging screen.. shuts off the screen, then does the process again. So the only way for the device to charge is the above mentioned method.
Just today I discovered that apparently the bootloader on these devices needs to be unlocked before flashing (no mention of this was found in the rooting instructions I followed). I'm guessing this secure boot error message is because my bootloader is still locked? Could this be the cause of my USB connection issues as well?
Currently I have a CM 13 nightly installed with TWRP and other than the above issues, the device seems to work fine otherwise. Before hand it was on stock Lollipop. Between all the threads I've read about this, I am just straight confused and lost at this point. I apologize if this is a re-posted issue, but I can't seem to find any info about it otherwise.
As a side note, I discovered the cable they shipped it with is damaged and doesn't work. I'm using the cable for my old Samsung Galaxy S4 (SGH-i337 - Canadian model). Could that also be an issue?
Thank you so much for any help! I really like this phone and I want to get it to work.
First off, it absolutely refuses to switch to MTP or any other mode when connected via USB. The USB configuration seems stuck in Charging mode. I've hunted through the XDA forums again and again for a solution, but none of the ones provided have worked. I've tried several different cables, factory reset, several ROMs with no luck. If you plug the device in while it's turned on, whether to a computer or wall socket it won't even charge. In order to get it to charge I have to power off the device, turn it back on, connect the cable on the LG boot screen, and then it will charge the battery. I'd assume at this point its a bad USB port, but why would it still be charging at all if that is the case? Which leads me to believe this is related to my other problem...
I rooted the device with King Root successfully, installed TWRP manager and flashed the latest TWRP for my device. Since then I get an error screen on boot that says "Secure boot error 1003". When the device is turned off, it flashes between a screen with a battery icon that has that same error message on it, to the battery charging screen.. shuts off the screen, then does the process again. So the only way for the device to charge is the above mentioned method.
Just today I discovered that apparently the bootloader on these devices needs to be unlocked before flashing (no mention of this was found in the rooting instructions I followed). I'm guessing this secure boot error message is because my bootloader is still locked? Could this be the cause of my USB connection issues as well?
Currently I have a CM 13 nightly installed with TWRP and other than the above issues, the device seems to work fine otherwise. Before hand it was on stock Lollipop. Between all the threads I've read about this, I am just straight confused and lost at this point. I apologize if this is a re-posted issue, but I can't seem to find any info about it otherwise.
As a side note, I discovered the cable they shipped it with is damaged and doesn't work. I'm using the cable for my old Samsung Galaxy S4 (SGH-i337 - Canadian model). Could that also be an issue?
Thank you so much for any help! I really like this phone and I want to get it to work.
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