If you lose one of your WF-1000XM4 earbuds and buy a replacement, you'll need to reset ('initialise') them to sync the earbuds together. You have to do this before activating Bluetooth pairing mode.
00:00 Put into case and hold both earbuds for around 10 seconds. Release when the case flashes red slowly.
00:21 The case will then flash green rapidly a few times to confirm initialisation. The earbuds are now synced to each other.
00:26 Remove from case and they will go into Bluetooth pairing mode.
Remove the previous Bluetooth pairing from your device before initialising the earbuds.
This will only work if the earbuds are on similar software versions. If one earbud is on v1 but the other is on v2, they won't sync.
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