This application is tested and supported on the following iOS versions and devices:
iOS 14.x, iOS 15.x and iOS 16.x
iPhone 11, iPhone 12, iPhone XR, iPhone XS, iPad Air, iPad Pro, iPad Mini, iPod Touch 7
Please see the user guide for supported printers.
The ZQ200 series, ZQ112, ZQ120, ZR118, ZR138 printers require firmware version 88.01.04 or later to work with the app
See this support article for instructions on where to get the firmware and how to upgrade your printer.