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os.writeBytes(command); os.writeBytes("exit\n"); os.flush();

If the user has downloaded a newer Tow-Boot.img file, the app can flash it to the boot or env partition. tow-boot bootloader apk

You might flash it to the beginning of your SD card. Benefits of Using Tow-Boot over Stock Bootloaders Its purpose is to provide a standardized, graphical

Tow-Boot supports a variety of single-board computers and mobile devices, including: and various ODROID boards.

Tow-Boot is not an Android app; it is a (similar to a BIOS) designed for ARM devices like the PinePhone , PinePhone Pro , and various ODROID boards. Its purpose is to provide a standardized, graphical boot menu and "USB Mass Storage Mode" for easy OS installation. General Installation Guide

There are apps like or EtchDroid that allow you to write disk images to SD cards from your Android phone.