[LG K10 Guides, News, & Discussion] gottlasz:
First of all there is a guide already for some devices made by pvineeth97 so if you have one of those devices, you better use his description:

http://xdaforums.com/lg-k10/how-to/guide-upgrade-downgrade-lg-k10-t3488250

Secondly this guide is not meant to be providing kind of a "one click" method. This guide is meant to provide you info about how to make lg up recognize your device.

You need a working LG Bridge (this would mean that you installed all the necessary drivers already).

Also download a firmware for your device, you can use this guide by Kappu:

http://xdaforums.com/lg-k10/how-to/guide-downloading-kdz-lg-bridge-t3504497

Extract LGUPc.dll from your kdz file using lg firmware extractor (http://viid.me/qe7ufH) or if you use Kappu's guide there is also a folder you can find this dll file.

Rename LGUPc.dll to LGUP_8916.dll

Get LG UP lab version (1.10) (you can find it on xda)

After you installed it, do not run it.

Put LGUP_8916.dll into folder:

"C:\Program Files (x86)\LG Electronics\LGUP\model\8916"

Download (http://viid.me/qe7ijc) or make your own reg file consisting these lines:

[HKEY_CURRENT_USER\SOFTWARE\LG Electronics\LGUP\Model\K35010e]

"DLL_PATH"="C:\\Program Files (x86)\\LG Electronics\\LGUP\\model\\8916\\LGUP_8916.dll"

"MODEL_NAME"="K35010e"

[HKEY_CURRENT_USER\SOFTWARE\LG Electronics\LGUP\Model\K35010e\Provision]

"BIN File"=" "

name it: "k350n_.reg" or whatever device you have (mine is k350n)

as you can see in the reg file there are three instaces of "K35010E". This is my device "id".

If you have a different device (which is rather likely) you will need to use it's "id". Firstly you can chose it from the name of the kdz (the first 4-8 characters of the kdz filename).

Now import this entry to registry (double click on the ".reg" file).

Later on when you try to connect your device and start lg up it will show you a small window (Model List) and if in that window in the first column (under "model") it sais "unknown" then in the next column ("Com ports") you can read the device "id" you have to use, right after the com port (eg. COM4, K35010e).

So change all instaces of "id" regarding to your devices "id" and import the reg file again.

Also you can download pvineeth97 reg files to see how they work and prepare your own.

Now put your phone into download mode (turn it off, hold vol+ button and connect to usb).

Once its connected and all drivers seems to be properly installed you can run LGUP. See above what to do when you have the unknown model error.

When your phone is properly connected, you can chose the proper kdz file and flash it (refurbish -> start).

Sometimes phone reboots twice so don't get scared after the first boot up this might reboot rigth after.

All data will be lost if you use refurbish mode! Optionally you can try using upgrade mode so you will not lose any data however might not solve your problem.

Sometimes when the second time you use it the device id changes so when you have that unknown device error message you have to change the "id" accordingly and add it to registry again (update the reg file and double click).

No promises and no responsibility by me...