Keyboard shortcuts

Press ← or → to navigate between chapters

Press S or / to search in the book

Press ? to show this help

Press Esc to hide this help

Fastboot Getting Started

Dioxamine includes native Fastboot protocol support over USB OTG. This allows you to flash custom partition images, test boot recovery/kernels, manage bootloader lock states, and run raw Fastboot commands directly from your phone.

Fastboot Connection Requirements

  1. USB OTG Connection: Fastboot requires a physical USB OTG cable connection between your host phone and the target device. Fastboot does not operate over Wi-Fi.
  2. Target in Fastboot / Bootloader Mode:
    • Power off the target device.
    • Hold the device’s hardware button combination (typically Power + Volume Down on most devices, or Power + Volume Up on certain models) until the Fastboot/Bootloader screen appears.
    • Alternatively, if the device is currently booted into Android with ADB connected, use Dioxamine’s Reboot Menu > Reboot to Bootloader.

Device Connector Card

At the top of the Fastboot tab:

  • No Device Connected: Displays USB Detector Active • No Fastboot Device Connected while the background USB listener is waiting for a device to be connected.
  • Multiple Device Chips: When one or more devices in Fastboot or Fastbootd mode are plugged in (including multiple devices via a USB-C OTG hub), each device appears as an interactive chip showing its label.
  • Switching Devices: Tap any device chip to immediately switch the active Fastboot session to that target device. The selected device chip is highlighted.
  • Expandable Device List: Tap the expand arrow on the right to view all detected devices, their connection states (Connected or Detected — not connected), and individual Connect / Disconnect buttons.

Sub-Tabs Overview

The Fastboot screen is divided into two primary sub-tabs:

  1. Actions: Guided graphical cards for common maintenance tasks:
    • Reboot Options: Restart to System, Bootloader, Recovery, Fastbootd, Continue Boot, or Shutdown.
    • Flash Image: Flash any partition (boot, recovery, init_boot, vendor_boot, system, etc.) with image files.
    • Boot Image: Temporarily boot a kernel or recovery image without modifying device partitions.
    • Lock State: Unlock or lock bootloader states safely.
    • Variables: Query bootloader variables (e.g. current slot, battery voltage, secure boot status).
  2. Shell: An interactive Fastboot command-line terminal with real-time log output.