1. ⁠Prepare your devices: You'll need another Mac (2016 or newer) with USB-C ports and a USB-C to USB-C cable, as well as Apple Configurator 2 (a free app from the App Store).

2. ⁠Boot the locked iMac into DFU mode: Turn off the locked iMac. Press and hold the power button for 1 second. While continuing to hold the power button, press and hold these four keys simultaneously: Left Control, Left Option, and Right Shift. Continue holding all four keys for about 8 seconds. Release all keys once the DFU window appears in Apple Configurator 2 on the other Mac.

3. ⁠Connect the iMac: Connect the locked iMac to the other Mac using the USB-C cable, ensuring the cable is plugged into the left-most port closest to you on the locked iMac.

4. ⁠Use Apple Configurator 2: In Apple Configurator 2, select the locked iMac. Choose "Restore" or "Revive" (if available). Follow the on-screen instructions to complete the process.

5. ⁠Complete the reset: The process will erase the T2 chip's firmware and restore it to factory settings, effectively removing any firmware lock. Important Notes: Data Loss: This process will erase all data on the internal SSD, so make sure you have a backup if you need to preserve any information. DFU Mode: Getting into DFU mode can be tricky, so be patient and try a few times if needed. Firmware Recovery: If the restore process fails, you may need to contact Apple Support for assistance

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