Information about LG US991 aka LG G4

LG US991 Firmware List

Region File name OS File size Date Downloads
UCK
North America
US/United States
US99124a_00_0119.kdzFile exist in our server Unknown 1.42 G 2017-03-30 258 time(s)
UCK
North America
US/United States
US99125a_00_0317.kdzFile exist in our server Android 6.0.x Marshmallow 1.42 G 2017-04-13 252 time(s)
UCL
North America
US/United States
US99120c_03_0129.kdzFile exist in our server Unknown 1.42 G 2016-07-03 80 time(s)
UCL
North America
US/United States
US99121a_02_0620.kdzFile exist in our server Unknown 1.42 G 2016-07-20 80 time(s)
UCL
North America
US/United States
US99122a_00_0714.kdzFile exist in our server Unknown 1.42 G 2016-08-10 37 time(s)
UCL
North America
US/United States
US99123a_00_1118.kdzFile exist in our server Unknown 1.42 G 2016-12-12 124 time(s)
UCL
North America
US/United States
US99124a_00_0119.kdzFile exist in our server Unknown 1.42 G 2017-02-07 88 time(s)
UCL
North America
US/United States
US99125a_00_0317.kdzFile exist in our server Android 6.0.x Marshmallow 1.42 G 2017-04-10 125 time(s)

Here you can see region description table
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  • Subash

    Thank you lg-firmwares for providing kdz file.

  • AAnarchYY

    What is the number Following the Firmware? Is that the rollback version?
    IE: US99121a_02_0620.kdz (which is the one i have) would be Model US991 version 21a anti-rollback v2?
    If so, does that mean i would not be able to flash US99122a_00_0714.kdz even though it is newer, but has a lower anti-rollback?

    • We not recommend downgrade LG phone in new versions, only up version.
      If you downgrade you make this on own risk.

      • AAnarchYY

        22a would be an upgrade from the 21a i have right now though, wouldn’t it be?

        • Yes you can update 21a to 22a or 25a.

          • AAnarchYY

            Thank you, but you still haven’t answered my original question, about the file naming, is that number the anti-rollback or something else? and if it is, will that 22a with the 00 reset my anti-rollback or something?

          • This something else.