[Thinkpad Tablet General] joesnose:
*******DISCLAIMER**********...... neither myself or xda takes any responsibility for damage caused to you or your tablet if you choose to follow this guide!

It is for MARSHMALLOW and so far only tested on 4GB versions.

Your tablet must be able to enter DNX Mode. power on with both volume buttons pressed until it says DNX mode on screen.

This guide expects that you have probably already rooted your tablet and have some level of competence. just ask if you are stuck.

This guide can simply reflash factory image to YT3-X90L version. (LTE)

With a few more steps It can also fix YT3-X90F (wifi version) , however you also need to have a full TWRP backup for this one.

If you are reading this chances are you have stuffed up your tablet!! i managed to completely screw mine while messing around in the bios trying to get windows to boot on my YT3-X90F. Big mistake! no way to access BIOS to fix my errors. no recovery! no OS! just intel logo then reboot and repeat!!!

So after some internet digging was able to find aMarshmallow factory image for the YT3-X90L

Instructions.

1) Download factory image, do not unzip or extract.

[url]https://yadi.sk/d/GaiYOUqF3GXmmY&xid=17259,1500004,15700022,15700124,15700149,15700168,15700173,15700186,15700201&usg=ALkJrhjdbFsiXatmDp31rYS2ch3l42eJ3Q[/URL]

Or

[url]https://mega.nz/#!RUtznJYS!gjeS7Qqw956MsFMdCSlrFYVHMwnxsURn59jZ4ynx0UQ[/URL]

2) Download Intel platform flash tool lite (availiable for Windows, Ubuntu, Fedora and Mac) i think to install on windows you will have to disable driver signature enforcement. [url]https://windowsreport.com/driver-signature-enforcement-windows-10/[/URL]

[url]https://01.org/android-ia/downloads/intel-platform-flash-tool-lite[/URL]

3) Open flash tools and connect your tablet to your pc in DNX mode ( hold volume up and down together while turning on tablet) using a usb cable. you will know you are in DNX mode as it will say it on your tablet screen and show up in intel flash tool.

4) In Intel Platform Flash tool lite select browse in the top right corner then locate the factory firmware zip file you downloaded in first step. wait while the flash tool loads the firmware then select the Flash option next to your loaded tablet.

5) wait for flash to finish, provided there are no errors your tablet should be back working.

(I had some errors, probably because of how stuffed my tablet was!!! i selected configure above my tablet in flash tool and set it to "user2user" and then it flashed)

*********The next steps are only needed for the YT3-x90F!!!!!!!!! if you are still reading you have this device.**********

As we have flashed the wrong firmware we may find some problems with our device. mine would reboot on first setup, allow me to complete on second boot but after power down back at setup and reboot.!

6) complete setup after second boot, you can skip everything, no need for google setup, wifi etc, we just need to get to the Android OS.

7) once booted, go to settings and scroll to the bottom select about tablet. then click the info about "build number" 7 times, you are now a developer! go back to settings and you will see a new option here "developer options" open this and enable OEM unlocking.

8) Restart tablet in fastboot mode (power on while holding volume up) then issue command from your pc "fastboot flashing unlock"

9) download and extract twrp from first post here https://xdaforums.com/thinkpad-tablet/general/yoga-tab-3-pro-root-thread-instructions-t3319666 and issue the command "fastboot boot twrp.img"

10) Tablet will boot to twrp. restore your precious backup you saved when rooting your tablet that got you into this mess!!! restore all partitions.

I did this on my YT3-X90F and it worked out fine, back in business.

Good luck.

Here is a full TWRP backup for the YT3-X90F ONLY!!!, if you flash this to L variant you will lose LTE data connection. Up to date as of 07/04/2018.

[url]https://mega.nz/#F!kBUmEbaD!PvF_W9uBZQlBdPGocHqC_Q[/URL]