Did you got that annoying "Unknown Model" in LGUP and now are struck download mode. This usually happens when you try to root with dirty and do something wrong to mess up entire process.
What Actually happened in my case:
I had a friend who tried to root his H990ds with dirtysanta but due to some issues the whole process messed and his phone was struck in download mode. Phone was unable to go pass LG logo and boot. LGUP was unable to recognize the phone. We tried different ways, different drivers but all in vain. So, we were able to do this process and it worked finally.
This process was tested with H990ds. Here files for H990ds are provided. You need files respective for your model.
So I will not waste the time. Possible cases:
1: LG V20 stuck on download mode and it is now not being recognized by LGUP and you can’t do anything, because no other tool is available.
2: You installed a custom ROM and now LGUP is not recognizing it. You want to go back to stock and can’t do it.
3: Anything bad happened during flashing process, PC restarted, phone went off or whatever. And now you can’t bring it back to life.
Other cases you faced.
Read 4th post before proceeding,
Before asking a question, first, see FAQ in 3rd post. In that way you can save a lot of time.
Things You need:
1: LG UP
4 : LG Flash tool (the one used to bring LG G2, G3 back to stock).
5: LG Firmware extract tool
(All above files can be found in 2nd post)
6: Stock ROM for your device.
I used V10g KDZ for H990ds. You need to download KDZ of your specified model.
7: Dll specified for your model (in 2nd post H990ds dll is provided)
Uninstall all other tool, previous driver (including other phone’s too). Restart PC
Just to avoid problems. I tried this process many times on Windows 10 64-bit and it always worked for me. So it has no problems with new Windows OS.
Now follow procedure in exact order.
1: Install Latest LG drivers.
Put Phone in download
(Hold Vol+ and connect to PC while it was powered off).
Wait until it finishes installing drivers. Change COM Port to 41.
( Refer here for changing this, If you can’t understand that.)
Now DC it from PC and keep it staying in Download mode.
2: Install LG Flash tool and copy megalock.dll to installation directory or it won’t work.
3: Install LGUP_Store_Frame_Ver_1_14_3.
4: Extract LG Firmware Extract and copy Stock KDZ to that folder.
5: Run WindowsLGFirmwareExtract.exe. Click on Open.
6: Select your KDZ. Select all content off kdz.
7: Click on extract kdz. Wait for kdz to extract. You will notice a dz and LGUPc.dll.
8: Run LG Flash Tool. Select Manual Mode.
9: Select LGUPc.dll in dll section.
10: Select .kdz in S/W section (You will have to select show all files to make .kdz visible).
11: Now Begin downloading by pressing "Yellow Right Arrow". Connect phone in download mode.
The step will fail at 4%. Now Disconnect phone. Do not turn off phone. Just disconnect it.
12: Now exit and start LG Flash Tool again. Select Manual Mode. This time Select LGUP_H990ds.dll this time for dll section
(You need different dll for different model. For example, "LGUP_VS995.dll" for VS995 variant )
13: Now select that extracted dz in S/W section this time. Click on Start Arrow. Connect phone.
14: This time the flashing will begin. It will go upto 150%. Wait for it to complete.
After flashing phone will boot into a screen with a big 2 on screen. After some time it will change into big 3.
15: When it changes into big 3. Pull the battery and start the phone.
Your phone should start after some time. It should be detected by LGUP.
For Phone Stuck at Big 2:
If your phone stuck at big 2 during process then you will have 2 choice, either restart process from start or flash this time with LGUP. Because phone is now running a fully stock firmware it should be detected by LGUP completely. You can simply flash kdz with LGUP and it will not show big 2 on screen. You need to start LGUP with uppercut.