https://www.cisco.com/c/en/us/support/docs/storage-networking/mds-9000-san-management/213567-mds9000-boot-loader-prompt-recovery.html
Recover MDS9000 Boot Loader Prompt - Cisco
This document describes how to recover a Multilayer Datacenter Switch (MDS) from Boot Loader Prompt and Boot Mode.
boot loaderrecoverpromptcisco