Re: Too late
A decade ago, I held in my own hands a counterfeit Cisco switch that included a hardware backdoor that was traced back to China.
A bit worse than outright copyright theft [which I have seen evidence of back in around 2008-ish].
I was working for a oompan that made antennas, designed in the USA, but made in China and sold to other companies in China. During a meeting they showed (on a projector display) an antenna that had been produced in China, not by a licensed manufacturer. The antenna had similar performance but of course was WAY less in cost. The thing is, the designer of the antenna worked the company logo into the design such that excluding it would de-tune the antenna and ruin its performance. An X-ray of the antenna showed that the company logo was there, underneath the plastic, but "fuzzy" like it had been copied from an X ray of the original.
But I have not seen cases where software or firmware had been deliberately "back door'ed". I had actually written a lot of that firmware myself, based directly on the SDKs for the chip makers (Broadcom, Atheros, TI, etc.). So I cannot attest to a back door, but I _can_ attest to the copyright fraud. Still, it does NOT surprise me in the least.
And, being "in the industry", I can definitely understand HOW a hardware back door into one of these embedded systems COULD be done. The fact that it was (apparently) tried at least once should make the rest of us VERY suspicious until complete trust has been ensured.