[DAVEYK]

I flashed my Fero V501 phone with SPD Upgrade tool and after flashing the phone doesn't come up anymore, it just vibrates when I press the power button with blank screen. I used the correct pac file I don't understand why is  not coming up.

[xerxes]

I flashed my Fero V501 phone with SPD Upgrade tool and after flashing the phone doesn't come up anymore, it just vibrates when I press the power button with blank screen. I used the correct pac file I don't understand why is  not coming up.

Might be battery drainage. 
Charge the phone with original charger for like 3hrs, you can also take out/re-insert the battery.

[DAVEYK]

I flashed my Fero V501 phone with SPD Upgrade tool and after flashing the phone doesn't come up anymore, it just vibrates when I press the power button with blank screen. I used the correct pac file I don't understand why is  not coming up.

Might be battery drainage. 
Charge the phone with original charger for like 3hrs, you can also take out/re-insert the battery.

I did that, but it is still the same way

[hovatek]

I did that, but it is still the same way

Its quite possible that the firmware you flashed is not for your build / variant