This command is used to unlock a portion of flash memory forcibly, allowing it to be updated. It must be issued for regions which have been locked before the FIS can reuse those portions of flash.
Note: Some flash devices power up in locked state and always need to be manually unlocked before they can be written to.
Unlock an area of the flash
RedBoot> fis unlock -f 0xa0040000 -l 0x20000 ... Unlock from 0xa0040000-0xa0060000: .