Lenovo Yoga Tab 3 10" (YT3-X50) factory image, OTA update or backup needed

I was playing around with some modifications to my rooted Yoga Tab 3, and I messed up - the tablet wouldn't boot anymore, even after a factory reset. I could still boot into recovery, so I was not too worried until I realized that I can't just download a factory image or an OTA update for my tablet in order to restore everything. In desperation, I tried flashing the update image for YT3_850F, which was available online. This made the tablet boot again (I can hear the sound and I can see it through ADB), but without anything being displayed on the screen, which is strange, since both tablets seem to share the same graphics card (Qualcomm Adreno 304). I think my only remaining option is to locate a factory image, or an OTA update for my tablet and flash it in recovery. Does anyone know where I can get an image for YT3-X50? Or maybe someone with a rooted tablet could do me and the rest of the Internet a huge favour and make a backup image of their tablet available? Are there any other recovery options that I am missing?