J189 phones labeled as J189 D01B use version 4 hardware. That hardware uses a different chipset from previous J189 phones and therefore requires different firmware. The firmware, and updated J100Supgrade.txt to install that firmware, are part of J100 R4.0.12.1 or high firmware.
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If a J189 D01B phone is attached to an IP Office that is using a lower release of firmware, the J189 D01B will run using its factory installed firmware.
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If you are using IP Office Release 12, the J100Supgrade.txt file instructs the phones to load latest firmware if needed.
