I recently purchased an Acer E15 (E5-571-381E) having Intel i3 4005u
The cpu does well support VT-x, but in the bios there's no option to enable it.
The motherboad is "ea50_hb "
I want to know if there's any possibilty to enable like custom bios or something. I really need it for Android developement
Your laptop actually supports VT-x but the problem is it's not yet enabled and you'll need a modified BIOS to enable that system. It's very tricky to find the exact modified BIOS and the consequence of using a non compatible BIOS is it may not boot up anymore. I would suggest to contact Acer Support for more information about that issue.