Firmware for the M4 2.5-inch SSD is being updated from version MU01 to MU02. The M4 is updateable to this new firmware starting from previous versions using tools provided by Micron.This update will be mandatory cut-in for new product built in Micron factories, and is an OPTIONAL update for any drive in the field. Compatible with the new iMac models! Customer service. We do recommend you update your drive's firmware for. To reset the firmware password on newer Macs, you must now follow these steps: 1. Boot with Option key held to display the boot menu's firmware password prompt. Press Control-Option-Command-Shift-S to reveal a 33-digit hash (mixed letters and numbers) that contains an identifier for your specific motherboard and the Atmel chip used for your.
This feature requires a Mac with an Intel processor. For the equivalent level of security on a Mac with Apple silicon, simply turn on FileVault.
How to turn on a firmware password
- Start up from macOS Recovery.
- When the utilities window appears, click Utilities in the menu bar, then choose Startup Security Utility or Firmware Password Utility.
- Click Turn On Firmware Password.
- Enter a firmware password in the fields provided, then click Set Password. Remember this password.
- Quit the utility, then choose Apple menu > Restart.
Your Mac asks for the firmware password only when attempting to start up from a storage device other than the one selected in Startup Disk preferences, or when starting up from macOS Recovery. Enter the firmware password when you see the lock and password field:
Imac Firmware Lock
How to turn off a firmware password
- Start up from macOS Recovery. During startup, you will be prompted to enter the firmware password.
- When the utilities window appears, click Utilities in the menu bar, then choose Startup Security Utility or Firmware Password Utility.
- Click Turn Off Firmware Password.
- Enter the firmware password again when prompted.
- Quit the utility, then choose Apple menu > Restart.
Imac Firmware Password Removal Tool
If you forgot your firmware password
Imac Firmware Update 4.1.9
If you can't remember your firmware password, schedule an in-person service appointment with an Apple Store or Apple Authorized Service Provider. Bring your Mac to the appointment, and bring your original receipt or invoice as proof of purchase.