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There isn't one for 4.5.621, it soft bricked a couple phones, you can use the MX_4.5.604 version though, it flashes the nTelos Milestone X 4.5.604...
It sounds like it is having trouble unzipping the sbf file, how much ram does your PC have?
Yes, exactly. It would flash you to 4.5.601 gingerbread just like going to froyo then taking the OTA.
If anyone keeps root after updating please post the build.prop so we can take a look at it
That is/was the system version not the Android version.
OP updated with new 4.5.601 version!
Thanks joeblow789 and rabidturtles359 for testing!
My pleasure, glad it worked out for ya!
That's what I was afraid of, need Dan Rosenberg to take a look at these new Moto firmwares, I'm sure he can find a way in.
...and none of the currently available root methods work on this update?
Has anyone taken the update and retained root?
Alright guys, I have a new version done, added the ZergRush root script so you can root right after flashing if you want. I need a couple people...
It isn't quite that simple, the root file system is most of the OS, not just the .sbf file. No worries though, I'll get one for you guys. I will...
OP updated with some newer instructions and new hosting for the .iso file.