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    Wrong kernel on Redmi 9 (codename lancelot)

    Scheduled Pinned Locked Moved Xiaomi
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    • ? Offline
      A Former User
      last edited by

      I downloaded a daily build update and installed it, the update was successful.
      Sim 2 wasn't being detected nonetheless. So I decided to switch the sim cards. Sim 1 wasn't being detected. Hmm..
      I decided to test the problematic sim card on another phone - also a lancelot running stock android, it worked there.
      I decided to use an old sim card on my lancelot to see if it would be detected. It was.
      The problematic sim card was working just fine before switching to UT from Android.
      Anyway, it seems like UT doesn't like this sim card. Has anyone encounter this issue before? Is there a reason why UT would fail to detect a working sim card?
      Below are some screen grabs highlighting the above issue.

      screenshot20251030_213436991.png

      screenshot20251030_213638341.png

      Vlad NirkyV 1 Reply Last reply Reply Quote 0
      • Vlad NirkyV Offline
        Vlad Nirky @Guest
        last edited by

        @Keli
        To complete the test the non working SIM should be inserted in another phone running Android, to see if it is still OK.

        ? 1 Reply Last reply Reply Quote 0
        • ? Offline
          A Former User @Vlad Nirky
          last edited by

          @Vlad-Nirky I did test the non working sim card (the one that can't be detected) on another phone, also a lancelot but running MIUI. It works there. The old sim card that was decommissioned doesn't work in the sense that it can't register to its network and that's why it says 'unknown' as you can see from the screen grab - but at least it can still be detected by the phone.
          The working one that I would like to use fails to be detected on both slots hence the 'No Sim' error message.

          Vlad NirkyV 1 Reply Last reply Reply Quote 0
          • Vlad NirkyV Offline
            Vlad Nirky @Guest
            last edited by Vlad Nirky

            @Keli
            Is there a mix regarding VoLTE?
            One that has it and one that doesn't?
            Can your other phone hold two SIM cards?
            If so, it would be interesting to know if they can work together.

            ? 1 Reply Last reply Reply Quote 0
            • ? Offline
              A Former User @Vlad Nirky
              last edited by

              @Vlad-Nirky No it isnt a VOLTE issue and yes both sims are VOLTE capable and both work well together. I haven't tested VOLTE under UT on either sims though. But VOLTE is problematic even on stock Android for lancelot in my country.

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              • ? Offline
                A Former User
                last edited by

                I had to reinstall Android unfortunately 😞
                Both Sims are working. Will give UT another go sometime in the near future.
                Thanks everyone.

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                • ? Offline
                  A Former User
                  last edited by

                  I gave it another try, it's all good now.

                  screenshot20251102_074444373.png

                  Vlad NirkyV 1 Reply Last reply Reply Quote 0
                  • Vlad NirkyV Offline
                    Vlad Nirky @Guest
                    last edited by

                    @Keli
                    Hello.
                    Right after reinstalling?

                    ? 1 Reply Last reply Reply Quote 0
                    • ? Offline
                      A Former User @Vlad Nirky
                      last edited by

                      @Vlad-Nirky Yes it worked after reinstalling.

                      1 Reply Last reply Reply Quote 0
                      • ? Offline
                        A Former User
                        last edited by

                        When I say reinstalling, that's just putting it mildly.
                        Let me post this in the hope that someone might find it useful.
                        A couple of months ago I tested UT using the normal install procedure (Stock vendor, A11) vs an edge case procedure (OSS vendor, A13) and found out that UT worked roughly the same in both instances.
                        Since then, using OSS vendor has been my preferred method of getting UT on my lancelot -I'm the edge case, testing the untested.
                        With this method, I can easily test feature availability/issues between firmware versions (I cannot access the call waiting setting under firmware v12.5.6.0 but can with v12.5.4.0 for example), easily move between Android and UT etc.
                        So here's how I move from UT to OSS Android for example:

                        • Reboot the device into fastboot (The one with an orange text)
                        • Run fastboot flash recovery recovery.img
                        • Run fastboot flash boot boot.img
                        • Run fastboot flash dtbo dtbo.img
                        • Run fastboot flash vbmeta vbmeta.img
                        • Run fastboot wipe-super unsparse_super_empty.img
                        • Run fastboot reboot recovery
                        • Run adb sideload lineage.lancelot.zip once the device reboots into lineage's recovery.
                          I run these commands under linux and this workflow has never failed me.
                          I use an unofficial lineage 20 zip for lancelot which has all these files inside the archive.
                          To go back to UT, I just put the device in fastboot mode and run the ubports installer.
                        Vlad NirkyV 1 Reply Last reply Reply Quote 0
                        • Vlad NirkyV Offline
                          Vlad Nirky @Guest
                          last edited by Vlad Nirky

                          @Keli
                          Thank you for sharing your knowledge.
                          Very interesting...
                          And what LineageOS ROM are you using exactly?

                          ? 1 Reply Last reply Reply Quote 0
                          • ? Offline
                            A Former User @Vlad Nirky
                            last edited by

                            @Vlad-Nirky Here it is:
                            https://pixeldrain.com/u/u4qB51S8

                            1 Reply Last reply Reply Quote 0
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