Stuck in Fastboot mode

Hi, I have a serious problem with my moto G4 Play. I was on Android 7.1.1 but I prefer Android 6.0 so I tried to flash the stock ROM 6.0 of my device. It worked, but few minutes later my phone turned off.

Atm I only have access to fastboot mode but my Bootloader is locked, "USB debug" and "allow OEM unlock" are not activated.

I can do fastboot commands but I can't flash anything because Bootloader is locked, and if I try to use

Code:
fastboot oem unlock

, it says to allow OEM unlock in developer options first.

If I try to restart bootloader, restart recovery or factory reset it brings me back to fastboot mode with the following text :

Quote:

"Your device didn't start up successfully.
Use the Software Repair Assistant on computer to repair your device.
Connect your device to your computer to get the Software Repair Assistant.

AP Fastboot Flash Mode (Secure)
Fastboot reason : Failed to initialize partition table
CID Read failure
Invalid CID status 0x69
ERROR : No booting image fund. Skip to fastboot
Boot up failed"

Thanks

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