You have misplaced the password for your ICX device.
Perform the following to reset the password
Start a CLI session over the serial interface to the Brocade device.
Reboot the device.
While the system is booting, before the initial system prompt appears, enter b to enter the boot monitor mode.
Enter no password. (You cannot abbreviate this command.)
Enter boot. This command causes the device to bypass the system password check.
After the console prompt reappears, enable the prompt and assign a new password.
Brocade ICX 7450 48P