I have the latest iphone & my sprocket will not connect

@FST38, Welcome to HP Support Community!
 
Follow the steps below to isolate and resolve the issue.
 
Update the ios device, step 3 from this doc: https://support.hp.com/in-en/document/c05937610 
 
Reset the printer, hold the power button until LED flashes rapidly then release button and press once more to power off. The press again to power back on.
 
Try connecting.
 
Hope this helps! Keep me posted. 
 
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