I'm looking in my G3 F400S's (Korean) hidden menu and confirming that it works with the following bands:
WCDMA: 800, 850, 900, AWS (?), 1900, 2100.
GSM: 850, 900, 1800, 1900.
LTE: 1, 2, 3, 4, 5, 7, 8, 17, 20, 28, 40.
Also would like to say for those with the Korean version...I've rooted mine and flashed the SphinX G3 Neo V2.0 ROM...and I must say that I'm more than happy!!!
I'm able to access all hidden features like LTE-Only, my "home" ain't in Korea anymore, the default weather app is now Accuweather...and many other stuff that I preffer.
So concluding...root, install SphinX ( there's also the VDT V8 Full, but I find it too difficult to install and gave up) and install the G3 Tweaksbox from Google Play (you'll be able to modify many features from your ROM).
In theory, with LG FlashTool, you should be able to (with a build.prop edit), however you will most likely lose software LTE Band support. Just to give an example: The S/L variants offer support for LTE 850 MHz, whereas the K supports LTE 900 MHz in its place. On the S/L version, if you were to load the K factory software, you lose out on software recognition of LTE 850 MHz (unsure if the hardware is still able to connect, but I imagine it is both a hardware/software connection).
What this would mean is that though you should be able to load the D855 factory .TOT and .DLL, you will have conflicts with the software recognizing certain hardware aspects.
Ultimately, your best hope is that an awesome developer will create some type of universal super ROM that would let you flash certain features specific to your device. Also considering the D855 will have some kind of FM antenna, the FM radio software will be completely useless on our Korean variants, as we do not have the built-in tuner (we have a DMB tuner instead).
Hope this helps
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