Reinstall android OS on p8 lite

Hello, I've made a big mistake this afternoon.
I've installed Kingroot but I had no RW permission on /system folder so I installed TWRP and just tried to format /system folder.

Now I have no Operating system and the bootloader is locked, I should have a valid IMEI code but I cannot execute the .bat script to unlock the bootloader because I cannot set "File" option in the debug mode (no os).

I did a Flash backup before acting this but I don't know how to restore it

How can I fix this? can I reinstall Huawei p8 lite firmware anyway?

P.S. If I start my phone in recovery mode I get "UNLOCKED" and an invalid link

Does updating CM 13 nightlies reinstall a different kernel

I flashed squid kernel a little while back and today I updated my CM 13 nightlies through the update manager in settings and now it shows i have a different kernel. Any thoughts?

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