Linux SoftRaid system won't boot

Question

linux

Good afternoon. I decided to try soft raid, created a mirror with mdadm from two disks, then I decided to check how it works, zeroed the disks one by one with the command dd if=/dev/zero. then added back to the raid - everything was restored. But at the next boot, the BIOS does not see the operating system. It feels like the mbr is gone.
How can you restore?

Answer 1

unable to mount disk after booting from live cd - writes unknown filesystem type 'linux raid member'

Answer 2

Grub needs to be installed in the MBR on both drives.
You need to boot from livecd, build the raid and install the bootloader.