How do I perform a factory reset on the JBL Wave Flex True Wireless Earbuds?
To factory reset the JBL Wave Flex 2, tap the earbud twice and then hold for 5 seconds. This procedure is the same for both earbuds (L/R). After resetting, you will need to re-pair the earbuds with your devices.
From the official Jbl Wave Flex True Wireless Earbuds manual, page 12
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