Mirror Error of Rock5C lite

According to the doc, i execute the following command to use the mirror of lanzhou university:
sudo sed -i “s|https://radxa-repo.github.io|https://mirrors.lzu.edu.cn/radxa-apt|g” /etc/apt/sources.list.d/radxa*.list
sudo apt-get update
However, i got some error info in apt update progress like this:

But the state of the mirror is not sync. Please help to solve the problem.

Just the usual board support repository problems. Soon you’ll also see an expired certificate or something like this.

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Thanks, i will try after the stable os version had been released