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Or follow video: https://goo.gl/wPBfpi
On Android devices:
After downloading Create Self-signed Certificate successfully, you need to install the CA certificate to your device (follow this guide: https://support.google.com/pixelphone/answer/2844832?hl=en )
After installing successfully, follow the below step to enable web print on POS setting.
Enable WebPRNT On POS
After successfully setting up the printer, we have to connect the printer to the POS.
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