The machine is a Lenovo Ideapad-700s-14ISK model. Since it is an older M5Y model, it is compatible with the old Intel architecture of Fydeos. Tests have shown that the issues with the two major versions 18 and 19 are that the system freezes at the password input location after booting, entering a continuous loop;
After ruling out possibilities such as battery aging, incorrect date and time, and the system's secure boot mode, I ultimately reverted to version 17.1, and it worked normally again.
You can find the system image by searching on Google; there are download links in the international version forums, but surprisingly, there are none in the Chinese community. 😂