Possible bricked S4 clone.

First of all sorry if this is in the wrong place but I wasn’t sure where to put it.

I bought a Samsung Galaxy S4 clone, specifically this one: http:// www .aliexpress.com/snapshot /238037422.html

My partner rooted it which was absolutely fine but I insisted on him then flashing a custom rom onto it. I’m not going to lie I had no idea what this involved, what the risks were or even why I wanted him to do it.

Anyway during the installation of the new rom seemed to be going fine and he’s pretty sure it did finish installing but then it just died. The phone had full battery at the time. Since then we cannot get it to turn on. We’ve tried another battery but it just doesn’t power up. It also won’t charge now.

However when plugged into the PC it comes up as an unknown device, so I’m hoping the fact it’s still recognised as something means there may be some hope left.

I’m sorry if I’ve left a load of information out, I’m not really sure how to word it. I have no idea what I’m doing, I am just sat here with my lovely new phone not turning on

Edit: I’ve now found that the ROM it came with was bluebo b9500 which appears to be a custom ROM anyway