Download and Install bridgeOS 8.4 (21P4222) for iBridge2,12 / IPSW Downloads

bridgeOS 8.4 (21P4222) for iBridge2,12

✓ This firmware is signed. This means that you can restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

Your download should begin shortly. If it does not, you can download it directly here:

Install the latest version of Apple Devices from the Microsoft Store.
Plug your iBridge2,12 in to your PC.
Open Apple Devices, and navigate to your iBridge2,12.
Hold the Shift key on your keyboard, and press "Restore".
Select the iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_8.4_21P4222_Restore.ipsw file that you downloaded.
Wait for the restore to complete, and the iBridge2,12 to reboot.

Plug your iBridge2,12 in to your Mac.
Navigate to your iBridge2,12 in Finder.
Hold the Option or Alt key on your keyboard, and press "Restore".
Select the iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_8.4_21P4222_Restore.ipsw file that you downloaded.
Wait for the restore to complete, and the iBridge2,12 to reboot.

Install idevicerestore.
Plug your iBridge2,12 in to your PC.
Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
To perform a full erase restore, type idevicerestore -e iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_8.4_21P4222_Restore.ipsw and press enter.
Wait for the restore to complete, and the iBridge2,12 to reboot.

Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
Type Get-FileHash iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_8.4_21P4222_Restore.ipsw -Algorithm SHA1
The output of the command should match the following checksum: 8ffc1f903c2de052ef753c4e96de5867def77a27. If it doesn't, you may need to redownload the file.

Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
Type openssl sha1 iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_8.4_21P4222_Restore.ipsw
The output of the command should match the following checksum: 8ffc1f903c2de052ef753c4e96de5867def77a27. If it doesn't, you may need to redownload the file.

Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
Type openssl sha1 iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_8.4_21P4222_Restore.ipsw
The output of the command should match the following checksum: 8ffc1f903c2de052ef753c4e96de5867def77a27. If it doesn't, you may need to redownload the file.