Help Custom rom Installation Failed

[Samuel Pereira]

Hello everyone, I need help with this:

Installing zip file '/external_sd/Xosp-Unofficial-1092017.zip'
Skipping for MD5 check: no MD5 file found
Zip file is corrupt!
Error installing zip file '/external_sd/Xosp-Unofficial-1092017.zip'
Updating partition details...
...done

This error message appears when I try to install any rom on my phone.
I already did wipe data, cache and also wipe the system and internal storage.
I am using TWRP 3.0.M1-0.
The metod that I try to instal the rom is by an external SD, because the USB does not recognize in the computer.
The other way to install the rom would be by ADB but the usb does not work ...

 

[The_Chief]

Hi, Samuel, did you unlock the bootloader?

 

[Samuel Pereira]

"Hi, Samuel, did you unlock the bootloader?"
Yes