K01A ME70C I can only accesso to fastboot

I all I have an old memopad that I would like to revive for using I in a project. Afetr upgrading to lollipop for mistake I tried to boot in recover through rom manager and obviously it failed
Now I am stuck , I can load fastboot mode and it show unknow bootloader. How Can I revive it?

update:
I followed this tutorial https://forum.xda-developers.com/memo-pad-7/general/downgrade-asus-memo-pad7-me70c-t3735665
I managed to install the temp recovery but I am unable to mount the sd...

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