{nav icon=home, name=Main Page > icon=cogs, name=Installation Guide > PureOS boot prompt} PureOS boot prompt options --- == SeaBIOS boot selection == To get into device boot menu pres !!ESC!! key when Purism logo shows up, you will see something like this: {F27813, size=full, alt=coreboot prompt} To boot desired device simply press it's number. In the example above, !!1!! is internal sata hard drive, !!2!! is external USB drive. == PureOS boot options == If you start PureOS hybrid live/install system (for example, option !!2!! from the example above, provided that you have [[Recommendations/burn-using-etcher | prepared]] your USB drive) you will get to its boot options menu: {F27910, size=full, alt=boot options 1} Closer look: {F27908, size=full, alt=boot options 2} === Boot options === 1. **Start PureOS Live** > starts live PureOS instance from where you can perform [[Installation Guide/Live system installation|installation using Calamares installer]] 2. **Start PureOS Live (failsafe)** > starts live PureOS instance with safe boot options 3. **Install** > starts [[Installation Guide/Graphical installation|the installer]] 4. **Advanced Options** > //hardware detection tool// and //memtest// (memory testing tool)