Root [MetroPCS][LG Optimus F6 ms500]10e to 12d

[telsar]

Will this work to update the F6 to the latest rom before I begin my experiments?

http://androidcreations.weebly.com/unbrick-unroot-factory-restore-ms500.html

I am buying an old phone off Ebay to play around with and want to start with a 12b like the phone I use currently and want it to be identical.

Thanks.