Bricked Moto E 2015 (XT1527) - Won't boot

Hello, I came to this forums looking to get some help with a device that a friend gave me to fix. He tried to install some sort of custom ROM on his phone (Moto E XT1527), and after installing it, Im not totally sure what did he touch, but now the phone only boots up to a screen saying the following:

Quote:

AP Fastboot Flash Mode (Secure) BL: 80.0B (sha-2c9fcbc 2015-03-13 20:15:21) Baseband: Not Available Product/Variant: surnia XT1527 8GB P3 Serial Number: T00930M5JK CPU: MSM8916 ES1. 0 eMMC: 8gb Samsung RV=07 PV=01 TY=57 DRAM: 1024MB Samsung S8 SDRAM DIE=4GB Console [NULL]: null Battery Ok Device is LOCKED. Status Code: 2 Software status: modified Transfer Mode: USB Connected

(There could be some sort of typo on it)

So far I have tried with a tool that suposedly would flash a ROM into the phone without typing any commands, but it failed at some point.
As for unlocking the bootloader, I was abble to obtain the code, yet when I try to unlock it via fastboot, it says that I need the permission to "Allow OEM Unlock", wich I can't grant because of the SO not booting.

Regarding to what my friend did with it, he's not sure, but he think he deleted some sort of file

Im not an expert on this kind of stuff, yet I can follow steps that are given to me to provide any info or to execute a fix, so I would appreciate any kind of help from you to diagnose and solve this problem

Thanks in advance