Stuck at boot

Hi hoping someone can help, I accidentally wrote the wrong file to my system partition and am stuck at smartwatch 3 logo.
i tried pc companion and it tells be there "no software available for my device" all i can get to is fastboot mode stock recovery is gone too :(
I wrote twrp to it but as of yet have not been able to launch it. its running 5.1.1 os and i cant remember build number other than it began with an L

Please help
ZR1