adb push and wrong slash -> bootloop

I have my brand new Doogee S96 Pro which is now not able to boot.

I made a great fail:

instead of

adb push /sdcard/

i wrote

adb push sdcard

From that moment, no more boot.
I can’t get what I did, but I now can only boot in the TWRP recovery.

Someone could give me a tip on what I did and how to solve the issue? Thank you.