W: GPG error: https://cloud.embedfire.com/mirrors/ebf-debian buster InRelease: The following signatures were invalid: EXPKEYSIG 8C02E9210430241B laoyening <1337849843@qq.com>
E: The repository 'https://cloud.embedfire.com/mirrors/ebf-debian buster InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://cloud.embedfire.com/mirrors/ebf-debian carp-stm32-mp157 InRelease: The following signatures were invalid: EXPKEYSIG 8C02E9210430241B laoyening <1337849843@qq.com>
E: The repository 'https://cloud.embedfire.com/mirrors/ebf-debian carp-stm32-mp157 InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.