bricked phone

So,in my stupidity to install an ota update after rooting my phone,I managed to get it stuck in a bootloop. Now I followed some guides on the internet,downloaded the pre-rooted images,but fastboot doesnt want to flash system.img. I tried to download the img from different sources,none worked. The error just says cannot load system.img.I installed fastboot with the 15 second installer,I havent done any other modifications besides rooting and I cant even access recovery mode,it just shows me error in red text.Is there anything I can do myself or do I need to send my phone in service? Thanks! btw the model is ZE551ML