Bricked ZTE Blade C2 V809

ZTE Blade C2 V809

Well I simply changed recovery-from-boot.p name to recovery-from-boot.p-bak and install-recovery.sh to install-recovery.sh-bak

Now the phone doesn't boot properly, in fact it's stuck in a boot loop:
-Starts
-Shows white ZTE logo on screen
-Restarts

Tried connecting the phone via USB cable and used fastboot devices & adb devices commands, no devices found.
Also tried pressing "power + vol down" and "power + vol up", nothing. I can't enter recovery mode or bootloader.

I need another way to get in and change the name of those specific files, or re-install the OS.
I need help finding the desired solution for this specific phone or similar brand one, or some kind of expertise who knows more about this.

There's always a way.