guys need some help pls,, is there any other way to bring back to life my z140, try'n to upgrade firmware, it went on booth loop, then died, never turn on again..... 

Have you tried pulling the power connector out, then back in? And make sure you eject the sd card that has the firmware update on it, as the unit will continue reading it at boot time.

Have you tried pulling the power connector out, then back in? And make sure you eject the sd card that has the firmware update on it, as the unit will continue reading it at boot time.

You're answering a ~ 2yr old post. BTW, I doubt that would do much if it crashed during F/W update.