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I am using LG V20, model number is LG-F800K. 2 days ago, I installed the official update to Android 9. However after the update, my phone became battery drained faster and worked slower than before. I have tried at least the following 3 ways to try to get back to Android 7 or Android 8:

  1. https://forum.xda-developers.com/v20/how-to/guide-lg-v20-to-life-t3827732 -> "Download failed" error.
  2. https://lg-firmwares.com/how-to-flash/#how-to-flash-new -> Unknown model.
  3. https://lg-firmwares.com/how-to-flash/#how-to-flash-old -> Error "could not connect to server".

As of now, I really don't know how to reduce the Android version on this device?

I would appreciate your help.

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    afaik unlocking bootloader will let you by-pass anti rollback protection, but this requires a factory reset
    – alecxs
    Dec 19 '19 at 16:21
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I have downgraded the version successfully. You need to use LGUP DualMode in this case, it will help identify your device!

You can download it here (Copyright © by TecKnight): LGUP_DualMode.zip

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  • What is your connection to this download? Are you the developer, creator, or owner for it? Should there be a disclaimer of personal interest here?
    – wbogacz
    May 10 '20 at 14:45
  • @wbogacz It works on computers, you just need to plug your phone, via USB cable into download mode, it is recoverable. That software was given to me by a foreign friend who works at an LG store, I added copyright information based on the upload account name because I didn't know exactly who was the owner of it. May 10 '20 at 16:10

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