Just got my replacement phone from Verizon pre-built with the 418 OS. Honestly I thought I wouldn't be able to root, but I managed to SBF back to 2.3.4 using the DTN-150. Oddly enough it didn't factory-reset the phone like it normally does, and I was stuck in Roaming Mode until I did that myself. After the reset, re-activated my phone without issues, my previously 2.3.5 - 418 OS now back to 2.3.4 380. Everything seems to be working fine now.
With one exception, how did you update back to 2.3.5 418? I'm checking System Updates and keeps saying my phone is up to date. And I mean 418. xD
Above : Finished Product