Since there is no "Tow-Boot APK," the standard installation process for mobile devices like the PinePhone Pro involves these steps: Releases · Tow-Boot/Tow-Boot - GitHub

Unlike standard U-Boot, Tow-Boot often includes a simple graphical menu for selecting boot options using volume keys or a keyboard.

It removes the need for every Linux distribution (like postmarketOS , Mobian , or Arch Linux ) to ship its own custom U-Boot build.

Tow-Boot is a project that aims to make booting ARM devices "boring" by providing a consistent, user-friendly experience similar to the found on traditional PCs.