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getting the right and complete firmware




upon installing Debian stretch I got a notice about missing firmware (Atheros). I managed to find a package that, apperently, contained some of the missing firmware, since the list of missing firmware was diminished. I am still missing some firmware, I will find it eventually, but my question is: Can I be sure I have the correct and required firmware if I am not getting any errors from dmesg ? or upon boot?
Is there any tool that will help me address these issues?
thanks,