Bootloop on MID-U705B Tablet after editing build.prop topic

Hello everbody,

i am new to xdadevelopers and this is my first post. I hope im doing everything right!

Im working on a university project where i need to build two android kiosk devices. The devices im using are called "MID-U705B", those are cheap chinese tablets. To achieve a kiosk mode i update the build.prop file. Everything worked fine a few time, i could enable and disable the systemui like i wanted. Unfortunately when i update the build.prop again yesterday i must have made some mistake, because the device got into a bootlop. Even after restoring the old build.prop the error persists.

I cannot simply flash back the stock rom because i dont have it.
So my question is: Is it somehow possible to clone the rom from the identical other device to the broken one?

I am very happy for any help or advice!

Best regards,
skatehans