Also, Verizon in the U.S. just officially stopped using ANY gsm or cdma on January 1. But even prior to that, they designed this palm to really work well on LTE only, and I don't think mine ever connected (or can connect?) to any GSM or CDMA. It's really just LTE, and I believe that is how the radios are configured in the 1AMD update. I know that this has caused problems for others who are using SIM cards or providers that rely on GSM, and sometimes won't work without having those out-dated technologies in the configurations. Again, not 100% sure, but might be part of the problem.
I'm currently installing Parallels VM (cause I got a free student version). I'm going to try to pull the firmware from that...still not sure where the difference is, but I notice that certain root checkers (about 50% of the ones I've tried) instantly detect that it is rooted, while they never did so with the Verizon version. It isn't actually rooted, but maybe those are picking up on an unlocked bootloader or something... I tried booting into the bootloader and using fastboot, but it still didn't work. I'm gonna extract the firmware now. Keep ya posted!