[Thinkpad Tablet General] Deleted member 5232707:
THESE COOKED ROMS ASSUME YOU HAVE ALREADY AN

UNLOCKED BOOTLOADER AND TWRP AS RECOVERY

SYSTEM. You can flash them using TWRP, after wiping ART, cache, data, boot and system partitions.

FINAL RELEASE: Well... this is the final release from me and it is specifically for the WiFi model. I hope it is worth it for you. It is more stable and somewhat updated, anyway, if you use a X90F (wifi model) you will probably like it. The other versions are still up for whatever reason. Here's the link. Follow this guide by @Quardah if you are coming from a factory ROM. Go to post 46 if you can't get past the setup wizard. A barely tested (by @Nuihc88) version for the 3G (X90L) model can be found here.

NOTICE: If you find this work useful, mirror it. I won't be hosting it for free forever and it is becoming a burden to my Nextcloud installation. One would say this is a pretty much forgotten thread, but I'm seeing almost daily download activity. I'm putting the ROM files offline now and getting away from XDA for a while. Please don't DM me for the files. If you are looking for them, ask others in this thread. Good bye.

||||||||||||||||||| FROM HERE IS JUST INFORMATION YOU PROBABLY DON'T NEED |||||||||||||||||||

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ORIGINAL POST STARTS HERE. This is general information that I collected for geeks or desperate users that bricked their tablets. When I started this post it wasn't intended to produce a cooked ROM that would include most of these hacks. You don't need this if your tablet boots to Android or TWRP. You also don't need this if you are ready to flash the cooked ROM.

(This is a lenghty post. I suggest you to navigate by section header and find the one you might need.)

There are several Lenovo Yoga 3 tablet models out there and, while some of them enjoy of prime community support as the Yoga Tab 3 Plus, this Intel Atom powered tablet is pretty much forgotten and, at the same time, users were recently buying this tablet, which is a great piece of hardware but has the most terrible support by Lenovo.

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ROOTING THE LENOVO YOGA TAB 3 PRO (YT3-X90[FL])

Here I am not gonna write a lot. Instructions were given in this thread. I'd only recommend to put vm.targetutilization at 0.8 top 0.85 in system/build.prop

After rooting, debloat your firmware. I use the app "/system/app mover" from Fdroid to convert to user apps and uninstall them. Also, if rooting is not your cup of tea, you can install AppOps software to freeze all those apps that you don't use regularly. Also, I couldn't patch my services.jar for Signature Spoofing with Nanodroid patcher in the most recent lollipop firmware, but it did work in Marshmallow... anyway I'll do it manually.

ARE YT3-X90F AND YT3-X90L FIRMWARES INTERCHANGEABLE?

I own a WiFi only device (YT3-X90F) so I can't assert they are interchangeable. If I owned the LTE version and use a WiFi firmware I would expect to loose LTE functionality. Now, on the other direction is more interesting because I've been using a LTE firmware version for weeks (as a matter of fact, the one joesnose linked in his How-To debrick this tablet, flashed with the instructions I posted for advanced users it even updated to recent 2020 firmwares). The only tweak you need for this to work well is to add "ro.ril.disable=1" in the build.prop file. So, yes, firmware for the LTE version work in the WiFi version but kind of not vice versa.

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PHOTO ALBUM OF YT3/X90Y BIOS

This photo album documenting every screen option in the BIOS of the Yoga Tab 3 Pro may or may not help someone, but it contains a lot of useful hardware information and guidance for those attempting to boot something else than the original Android 5 or 6 firmware. Using this options, that are accessible through F2 at boot with an attached USB keyboard, you could try Linux distributions on the tablet or even attempt to run Windows, @alquez informs it works fine with a recent distro but the mainline kernel is lacking touchscreen and battery support. This is absolutely his work and he asked me to share it. I hope it serves someone. It is hosted in a rather obscure website but it was the only reasonable placeholder I could find for the 321 photos.

Hope this helps someone, I just didn't want to keep it to myself. Have a nice day!