We would like to inform you that on Lenovo YangTianM4600C PCs, when restoring the bootloader in anaconda, a kernel panic happens in the following 2 cases:
1) enter the "restore bootloader" interface and click "back", the system hangs.
2) click reboot after restoring successfully bootloader, the system hangs.

This is a machine specific issue. Our engineers are working on fixing this issue.