@MrT10001 I reran the installer three times. It didn't work. So the third time I used this guide. And it worked! You're awesome man! Thanks!

@MrT10001 Getting stock Android 11 onto the Lenovo Tab was a real challenge yesterday. Problems: SPflashtool failed due to chip permissions. Attempts using MTK bypass tools also failed How it filaly worked (after ~3 houres) Download Lenovo Software Fix Tool (thanks for the tip) Create a Lenovo account (using a disposable email address) Start the recovery workaround (but you can only flash up to Android 10 !!!!) OK, perform a recovery with Android 10 The recovery tool downloads the ROM (A 11) to your PC Before starting the recovery, you must replace the downloaded Android 10 files with the Android 11 files witch you downloaded from the UBports link bevor. Then start the recovery process and the Lenovo Software Fix Tool will flash the tablet with Android 11, which you’ve placed in its nest, just like a cuckoo’s egg. Translated with DeepL.com (free version)

@MrT10001 then I guess it's not for me. Thank you all for the clarification.

@developerbayman @moem thx for your answers I will follow your thread and check for progress. The Lenovo is still in use, but if neccessary i can do experiments. Thank you for your effort, i can only install if anybody did the hard part. Bogi

@gpatel-fr thank you for the mkv samples! @gpatel-fr said: this 'Microsoft MPEG-4 4.2' is probably the same thing as your '10 bit support'. not really, the issue is definitely the bit depth of the video, correlated with the format profile. Higher definition videos such as H.264 AVC "High 10" profile (using mediainfo) : Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : **High 10@L3.1** Format settings : CABAC / 5 Ref Frames Format settings, CABAC : Yes Format settings, Reference frames : 5 frames Codec ID : V_MPEG4/ISO/AVC Duration : 46 s 0 ms Width : 1 024 pixels Height : 576 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 24.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : **10 bits** Scan type : Progressive Writing library : x264 core 165 r3222 b35605a Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=18.0 / qcomp=0.60 / qpmin=0 / qpmax=81 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 Default : Yes Forced : No Color range : Limited Color primaries : BT.601 NTSC Transfer characteristics : BT.709 Matrix coefficients : BT.601 To reproduce this, you can use ffmpeg to enforce a higher bit depth on any of these samples: ffmpeg -i test5.mkv -c:v libx264 -pix_fmt yuv420p10le -crf 18 -preset slow -c:a copy test5_10bit.mkv and confirm it does not play on the UT player, despite desktop OSs having no issue playing it (at least that's my experience). It does, as you suggested, play on (libertine) mpv or vlc, so it seems like a limitation of the default player (I'd open a bug on the app repository, but can't seem to find it for the media player).

@formel Thanks for reply, fortunately I don't need to recover android (11) right now, asking just in case. I'll use lenovo recovery if needed.

@formel said: I apologies- got it working! ... I have now Ubuntu 20.04 on it. Impressed, that I got it working, but it was not trivial. I think it would be fair to change the title of this topic.

@karlk. Unfortunately that bricked my tablet. It has a smashed screen, so unbricking it is not going to be easy as I need to disconnect the battery... That is two TB-X606's that won't take a downgrade to Android 9 without bricking and it seems a common issue. I will persevere!

@Moktrull Yeah you need to download the SP Flash Tool and an Android 9 image for your device: https://drive.usercontent.google.com/download?id=18_vFVhQia5Zkedjy9Vz05x_wlNrN-sxe&export=download&authuser=0. This works for me (x606f). I had some issues using SP Flash Tool on Linux, so I recommend downloading the MTK drivers for Windows and flashing from Windows instead. Then flash that Android 9 image using SP Flash Tool. Unselect preload inside SP Flash Tool, then flash. After verifying in Settings that it’s Android 9, enter fastboot mode. Next, download the devel-flashable artifacts from here: https://gitlab.com/yassinrezai71/lenovo-x606/-/jobs/12500903564/artifacts/download Unzip it. After unzipping, flash the boot image: fastboot flash boot out/boot.img (or wherever the boot.img is located). Then format userdata: fastboot format:ext4 userdata After that, flash the Ubuntu image: fastboot flash system out/ubuntu.img Finally, reboot: fastboot reboot Wait until the device boots into Ubuntu Touch.

@Moktrull Yeah, sadly there's not much tablet choices for UT. I also like a tablet and for now, Lenovo M10 HD is my only option

@MrT10001 hi @MrT10001, I managed to install the system by doing it this way, based on the instructions from a post on the forum. This might help other people. Thanks for your help Video to enter Fastboot mode in order to unlock the bootloader: www.youtube.com/watch?v=cUOf0sF2RU4 Forum for commands to unlock the bootloader: forums.ubports.com/topic/10690/tb-x306f-3-gb-32-gb-android-11

@socialbox This seems to be a port that is in progress. Instructions on installing and helping out with testing are here.

Hi Tim, How much experience do you have? If this is your first time porting to a device, then I would suggest to begin using halium-13 first. I work on my first port (another Lenovo tablet), too, and it took me a long time to just get the kernel booting. The Andorid version begins to matter when the device boots so far that you can ssh into it. At that point you can worry about integrating halium 14. On the other hand, if you are experienced with porting then follow the advice to ask on the telegram channel how to base your port on halium 14 from the beginning. Kai

For anyone else wanting to run Linux on the Lenovo Tab M11. It seems the mentioned Lenovo support link contains wrong information. I can't download any image from their support site after registration on their platform, and the steps mentioned on the page seems to be for a desktop/laptop installation of Linux.

@kugiigi Brilliant thanks, I will take a look tonight

@W0nderW0lf Link to devices page. If it is not on there it is not supported. Some people create ports for devices, requiring a bit of searching, but a lot fizzle out due to various difficulties and are not supported.

@hlbkv Mine has dev-only channel as well. I haven't faced any issues so far. Perhaps the latest release will work on your device?