The first step to fixing a jailbroken iPhone that is stuck in recovery mode is to connect the device to your computer using a USB cable. If you have installed Cydia Impactor, this will be done automatically.
After detection, you will be able to see the “Fix All iOS Stuck” option in recovery mode. Tap on it and then select “Fix Now”. This will initiate the firmware update process.
Once the update process has been completed, you will be directed to a new screen where you will be able to choose a path to save the firmware file. Make sure that you choose a location on your computer where you can easily access the file.