> In an official statement, Huawei went on to call Bloomberg’s report “misleading” and said that the story “refers to a maintenance and diagnostic function, common across the industry, as well as vulnerabilities, which were corrected over seven years ago.” It added that “there is absolutely no truth in the suggestion that Huawei conceals backdoors in its equipment.”

It was never proven to begin with. Like any good backdoor it "could simply have been a mistake" (deniability).