I just bought a faulty vu+duo mini with red light fault. I did not know about clones to start with and thought I was buying a legit one, and I bought the red light fix kit off ebay (cap and chip replacement). Turns out this was no use to me as the clone has an external power pack, not internal which is what the kit was for. After a bit of digging, I found attaching a null modem cable from the back of the box to my PC and using Putty I was able to see the console boot messages from the clone box during boot up. It was showing it was booting which gave me hope. It was failing on not being able to generate FB0 (a video frame buffer). I downloaded an old VU+ Duo firmware (v1.6.6 i think) and installed it via USB. I watched via putty during boot with USB attached and it showed it was re-flashing. After flash, I restarted, and to my amazement it booted. I understand there is bricking code added to the latest vu+ images to kill clones, so maybe this has happened to you. I would get a null modem cable and see if it will tell you anything on a reboot. If so, there is a chance that simply flashing an older image may bring it back to life!
J