What actually happened is that the original hack from the OP has been made unnecessary by the discovery of the NV edit method to unlock the stock XT926 VZW modem so that US GSM carriers are allowed with no other modifications and all supported bands function properly.
This method was first found on the XT907 RAZR M but works exactly the same on the RAZR HD/MAXX because they share the same chipset.
It requires diagnostic mode access to modify the NVM in the radio so it passes a check of the whitelist of allowed networks.
This method does NOT work on the original RAZR/MAXX or D4 because they have a hybrid SoC with a MDM6600 chipset.
Digital alchemy for the Droid and beyond.