For the second time i’m righting a review. First it never worked with iphone 6s plus, i have righten to support and nothing till today, that was 6 mothes ago. „Power too low, please contact our sales“ Right now it only crashes and can not open it. The home page of developer “safeheartus.com” is gone... And my oximeter it stil not working. So apple or safeheart, tell me what should i do???