How to fix the phone with dead USB boot for Z500

[sim1]

I have flashed a wrong USB Boot file into my Z500, I cannot turn it to download mode anymore. How can I fix the phone?

 

[chukelo]

I think you will need a serial cable to flash it, becouse usb only detects when cell is power on.

What boot file did u upload?

 

[Dr.Nabil]

i think it is dificult to recover ur phone
dead 4 ever

 

[reefer45]

I bet you have a 12 month warrenty for the phone so just leave it to a service point and make it their problem instead of yours.