To set up your HP 123 printer, the most common and recommended method is:

1. Go to the official setup website **123.hp.com** on your computer or mobile device.
2. Enter your printer model to download the HP Smart app or the appropriate printer software.
3. Follow the on-screen instructions to install the software and connect your printer to your Wi-Fi network or computer[2][5].

Alternatively, you can install the **HP Smart app** on your smartphone from the Google Play Store or Apple App Store. This app allows easy setup, printing, scanning, and managing your printer directly from your mobile device[3].

If you encounter issues downloading the software from 123.hp.com, such as compatibility problems or invalid download files (noted especially for some Mac OS versions), ensure your system meets HP’s requirements or try downloading the software directly from the HP Support website[1]. Also, Windows 11 users may need to check HP’s Windows 11 support resources for compatibility info and updated drivers[1].

For detailed step-by-step instructions and troubleshooting during wireless Wi-Fi setup, HP’s official support pages are helpful and provide guidance tailored to your printer model and network environment[4].

In summary:

– Visit **123.hp.com** and download the HP Smart app or printer software.
– Use HP Smart on mobile devices for the fastest setup.
– Follow the setup wizard to connect your printer to Wi-Fi and complete installation.
– Refer to HP Support if software download or connection issues arise.

This approach should allow you to set up your HP 123 printer successfully.