In my opinion, vendors are oblivious to the notion of the buggy code. From the releasing-a-product standpoint, there is a tested or an untested code. While pers

In my opinion, vendors are oblivious to the notion of the buggy code. From the releasing-a-product standpoint, there is a tested or an untested code. While personally I wouldn't be surprised that someone could knowingly release firmware containing known "stability issues", I doubt any vendor hides source code out of fear that someone else will discover some hypothetical bugs. Among other problems, finding bugs in an unknown firmawre is not so simple, as it requires an intimate knowledge of the underlying hardware (and a fair share of the bugs is closely related to its quirks), which might be not so familiar as, say, well-established (and relatively well-documented) Intel Architecture.