Acer Iconia 10 tablet B3-A40. Impossible to root? - Android Q&A, Help & Troubleshooting

I would like to root this tablet. Normally I can root my devices easily but it seems there is no way to root this?
I searched everywhere but found no help. There's no TWRP or CWM I can find. I tried the dreaded one touch root apps like Kingroot, Kingoroot.
I tried to unlock boot loader as the option is in the Developers menu. But however I try boot to bootloader I just get a black screen
Would appreciate any help or ideas

Any luck? I have 20 of these tablets and need to wipe/root/ install custom ROM on all of them ...

No luck so far unfortunately

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