What happened to my OG Sony WF-1000XM4 -    • Sony WF-1000XM4 Battery drain issue -...  

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00:00 Update 1.6.1
01:15 Poll numbers
02:44 Battery test results post-update
03:36 How to know if your XM4 is old or new batch
03:47 Sound quality difference?
04:49 Call quality comparison
06:12 Active noise cancelling comparison
07:23 Should you download this firmware?