(it's possible it had updated timestamps on dbs with outdated package data).
I didn't realise that was possible (without a mirror being malicious).
]]>Thanks for Trilby's suggestion, I had been checked Mirros WiKi, according to 2.1 Force pacman to refresh the package lists, issued "pacman -Syyu", I success to upgrade system.
Thanks again!
# pacman -Sy archlinux-keyring
(-Sy archlinux-keyring for only! Partial Upgrades are NOT supported!)
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