A bright spot was its smartphone business, posting "robust growth", with 240 million units shipped past year.
With the company on the Commerce Department blacklist, along with the Trump Administration labeling Huawei a national security threat, Xu acknowledged that 2020 will continue to be hard for the company to maintain its corporate growth strategy, which includes investments in cloud computing, 5G networks, smartphones and new technologies such as artificial intelligence.
The company shipped 240 million smartphones in 2019, up from the previous year's 206 million, the company said previously.
According to the intelligence chiefs in the US, Huawei can not be trusted as it is a threat to the national security of the country.
Huawei went to a war footing after the Trump administration blacklisted the Chinese goliath in May, labeling it a threat to US national security.
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Mr Xu said in his letter that Huawei would in 2020 "go all out" to build its Huawei Mobile Services ecosystem, which comprises services such as cloud storage and an app gallery, describing it as "the foundation of our ability to sell smart devices in markets outside China". The problem, apparently, is that Huawei's growth slowed dramatically in the second half of the year.
For its part, Huawei has always denied accusations that the company is a security threat or that its telecom gear would be used a backdoor for the Chinese government to spy on customers or governments that use its technology.
"Difficulty is the prelude to greater success, and adversity the whetstone of an iron-willed team", Xu said.
He said nothing will hinder Huawei's progress, although the United States government will continue to suppress the development of leading technology in the long term. Saying that survival is the company's top priority, Xu warns that mediocre managers "who have lost their enterprising spirit" will be removed faster than before.
But so far only Australia, Japan and New Zealand have followed suit.
"We thank the Indian government for their continued faith in Huawei", Jay Chen, the company's India CEO said in a statement. But other nations have not shut the door on Huawei, with Germany so far resisting pressure to exclude the company from supplying technology for its 5G infrastructure. Chinese law requires individuals and organisations to assist and cooperate with national intelligence efforts.