You can find this digit in the firmware build number (e.g., S901EXX 1 XXXX) or in Download Mode on the device. Technical Specifications

The Samsung Galaxy S22 (SM-S901E) Go to product viewer dialog for this item.

Samsung prevents "rolling back" to a lower binary level. If your device is currently on a higher BIT (e.g., BIT 2 or 3), you cannot install this BIT 1 firmware.