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@Polkuk
Have you reset the SB2
@Polkuk To reset it, turn it off and press again the power button for about 10 seconds until it vibrates. You might need to reset it as it might still try connect to Z2.
Hi @Polkuk,Try resetting the SmartBand 2 as suggested by @uliwooly and @alexdon, then try to connect it to your Xperia Z5 Compact again.
Let us know how it goes.