So SMIC N+2 7nm is crucial, their 14nm can't hack it since Kirin 710 used TSMC 12nm processes.
from CnTechPost
HarmonyOS upgrade may only support phones with Kirin 710 or newer chips
March 16, 2021
Chinese tech giant Huawei's new system HarmonyOS's upgrade may only support phones with Kirin 710 or newer chips, according to a well-known digital blogger on Weibo.
This means that the upgrade will be pushed to Huawei and Honor phones with Kirin 810, Kirin 820, Kirin 820E, Kirin 980, Kirin 990, Kirin 985, and Kirin 9000 chips, according to the blogger "@长安数码君".
The above-mentioned upgraded phones are only a tentative list and may be changed later, according to the blogger.
Huawei announced at the recent foldable-screen phone Mate X2's launch that it will push HarmonyOS upgrades for Huawei's flagship models from April this year.
In 2021, the HarmonyOS system will cover 200 million Huawei cell phone products, according to Wang Chenglu, president of Huawei's Consumer BG Software Department, in a press interview, adding that more than 90% of Huawei models currently on the market will be upgraded with the HarmonyOS system.
Huawei released HarmonyOS, a distributed operating system for all scenarios, in August 2019 and put it into use on the Huawei Smart Screen.
In September 2020, Huawei released HarmonyOS 2.0, a new version with comprehensive upgrades in the three core capabilities of distributed soft-bus, distributed data management, and distributed security.