Poor network. Health codes are based on real data, which can be generated by citizens or people who have returned to work through their own online declarations. After background review, personal QR code can be generated. When scanning with VivOy5 1 mobile phone, people can't get out. This is because the mobile network is used too much nearby, which leads to the overload of the base station and the poor network.
1. First, turn on the phone and switch networks.
2. Secondly, scan the health code with VivOy5 1 mobile phone.
3. Finally, refresh the page and the portrait will come out.