Re: HUAWEI in Canada. And right beside (900ft!) the USA border.
This is a pretty slippery slope for Huawei. Do they ship routers out with "back doors" pre-installed? I highly doubt it because they would not risk shipping routers with a special firmware to just anyone who might be able to find their "back door" by reverse engineering.
Don't think for a second that Cisco (and others) hasn't hacked the hell out Huawei products looking for such a back door. The discovery of such a back door could be devastating to Huawei because no one would touch their products if such a hole was found.
Is it possible for Huawei to cooperate with the Chinese government? Sure but you won't find any Huawei gear installed any place where they could really make use of such special firmwares. -- I do not, have not, and will not work for AT&T/Comcast/Verizon/Charter or similar sized company.
It is far more stealthy/sneaky if Cisco's contract manufacturer were to slip a backdoor in their firmware than putting it in Huawei. Also if one were to switch a critical shipment of Cisco gears with fake one that come with the backdoor... It is not like China have not made fake Cisco gear and sold them before.
Why have evidence pointing back to yourself when you could redirect that to your competitor and their unsuspecting customers?