Here are some rough but hopefully useful instructions to downgrade to your firmware of choice:
1. Get the LgDTVUpDater_04_2017.zip program. I won't post a link here to avoid any trouble
Google.
2. (Delete the "LgDTVUpDater" folder if you already set it up, that'll make it simpler)
3. Extract the zip to C:, so you end up with "C:\LgDTVUpDater"
4. Identify the firmware you want to downgrade to. You need the actual firmware file, which you can might be able to get from your countrys LGs support site at the moment. If not, hopefully you have it downloaded previously. ( I chose 04.31.05 as my target)
5. Copy the firmware to "C:\LgDTVUpDater\htdocs"
6. Follow the 3 first steps
here to identify what your Response file should be named.
7. Go to "C:\LgDTVUpDater\zagotovki\local\2016". Identify your model from the folder list. For example, for C6, go to "UH780, UH850-UH855, UH950-UH955, OLED E6, C6"
8. Go into one of the folders in there. The firmware numbers there shouldn't matter, as we'll edit it to fit the firmware we're downgrading to later. I used "04_30_55_GB_" as my base.
9. Copy the file you find in there to "C:\LgDTVUpDater\htdocs". The file name for my C6 was "HE_DTV_W16M_AFADABAA".
10. Rename the file to whatever you came up with in step 6!
11. Open the file you just copied in a text editor like notepad.
12. You need to edit this file to match the firmware you have downloaded. Here's the file I ended up with for reference:
Code:
<RESPONSE><RESULT_CD>900</RESULT_CD><MSG>Success</MSG><REQ_ID>00000000008076692602</REQ_ID><IMAGE_URL>http://snu.lge.com/SWDownload.laf</IMAGE_URL><IMAGE_SIZE>892884989</IMAGE_SIZE><IMAGE_NAME>starfish-dvb-secured-m16-7.deua.m16-727-04.31.05-prodkey_usb_V3_SECURED.epk</IMAGE_NAME><UPDATE_MAJOR_VER>04</UPDATE_MAJOR_VER><UPDATE_MINOR_VER>31.05</UPDATE_MINOR_VER><FORCE_FLAG>Y</FORCE_FLAG><KE></KE><GMT>19 May 2017 14:24:34 GMT</GMT><ECO_INFO>01</ECO_INFO><CDN_URL>http://snu.lge.com:80/starfish-dvb-secured-m16-7.deua.m16-727-04.31.05-prodkey_usb_V3_SECURED.epk</CDN_URL><CONTENTS></CONTENTS></RESPONSE>
Things to pay attention to here:
- <IMAGE_SIZE> should match the exact file size of the firmware. You can find it by right-clicking the firmware file and choosing Properties. Copy the bytes value like in this picture:
Remove the spaces after pasting it into <IMAGE_SIZE>
- <IMAGE_NAME> should be the exact name of your firmware file.
- <UPDATE_MAJOR_VER> should match the two first digits of the firmware version you're downgrading to, 04 in my case.
- <UPDATE_MINOR_VER> should match the last 4 digits of the firmware version, plus the dot inbetween, 31.05 in my case.
- <GMT> I entered the date the firmware file was created, you can find that in the properties of the firmware file as well. In my case it was 19 May 2017 14:24:34.
- <CDN_URL> you need to add the filename of your firmware after "http://snu.lge.com:80/". In my case it was http://snu.lge.com:80/starfish-dvb-secured-m16-7.deua.m16-727-04.31.05-prodkey_usb_V3_SECURED.epk.
13. Save the file
14. Go to "C:\LgDTVUpDater" and double click on "start.bat"
15. Answer N to the first question and press Enter.
16. Look at the IP address at the start of the next question. Verify that this matches the local IP of your computer. (
Here's how to find your local IP) If the address matches, answer Y and press Enter.
17. Repeat the previous step. If the IP matches, answer Y and press Enter.
18. Go to the internet settings on your TV, choose Ethernet or Wifi, select Edit, Uncheck "Set Automatically". Enter the Local IP of your computer into "DNS SERVER"
Click Connect. (It won't connect right now)
19. Go back to your PC and press Enter in the command window with yellow text. If you get any Firewall warnings, allow them all through the firewall.
20. Go back to the TV and verify that it connects to the internet (All 4 rings should be green in the window you entered the computer IP.
21. If it connects, go to General -> About This TV, and click "Check for updates". Hopefully it finds the firmware you want to downgrade to. Click "Install".
22. If all is well, it should start downgrading!
I recommend resetting the TV to Initial Settings after downgrading, to be sure it works as intended. I have no idea if this is needed, I just like to do it as an added precaution. Not doing it might be perfectly fine.
This was long and hard to read, but it should contain all you need to complete the downgrade successfully. Let me know if it works for you!
UPDATE: If you're running IIS on your Windows installation, you might have to perform the steps mentioned
here. (Scroll down to the instructions regarding Windows 10 and W3SVC) Be sure to reverse the steps once you're finished.