I have the same problem with my Blink, only in my case, I bought it off eBay, and I was warned going in. I was hoping I could fix it, but of course the endumbening trick didn't work. I thought I'd open up the nozzle to check for bad connections, but I couldn't find a bit that would fit the screws, despite having a whole kit of "security" bits. Anyone else have any luck with that?
I ended up putting it aside until I could get that sorted, and in the meantime I bought a pre-assembled OpenEVSE. (I'd half-intended to convert the Blink with an OpenEVSE kit when I bought it, but that kind of depended on the J1772 cable working.) The difference in size between the Blink and the OpenEVSE is comical, BTW.