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The main intended benefit of this is to prevent the forced automatic "upgrades" that you encounter after a factory reset or when you wish to use an earlier firmware. It is not going to prevent it, if you are using the "Sync" function (Thus the first paragraph of my boilerplate.). I can see where my original reply could have implied that. If the OP can live without deliberately calling the Sync function, he can use the older firmware, as I use older firmware.
You are right, of course, the actual "Phone Home" URLs are not maintained in the database. (I thought it might be in "etc", where the other hosts are, but I didn't find it.)
Luck;
Ken
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