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Amazon Echo Show 8 (amazon-crown)

From postmarketOS Wiki
Amazon Echo Show 8
Echo Show 8 with the weather displayed on it's screen
Echo Show 8 with the weather displayed on it's screen
Manufacturer Amazon
Name Echo Show 8
Codename crown
Model C7H6N3
Released 2019
Type embedded
Hardware
Chipset MediaTek MT8163
CPU Quad-core 1.3 GHz Cortex-A53
GPU Mali-T720
Display 1280x800
Storage 8 GB
Memory 2 GB
Architecture aarch64
Software
Original software
The software and version the device was shipped with.
Android (Fire OS) 7.1.2 (FireOS 6.5.3.1)
Extended version
The most recent supported version from the manufacturer.
Android (Fire OS)
postmarketOS
Category testing
Pre-built images
Whether pre-built images are available from the postmarketOS Installation page.
no
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
yes
pmOS kernel
The kernel version that runs on the device's port.
6.18
Features
Flashing
Whether it is possible to flash the device with pmbootstrap flasher.
Works
USB Networking
After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system).
Works
Internal storage
eMMC, SD cards, UFS...
Works
Screen
Whether the display works; ideally with sleep mode and brightness control.
Partial
Touchscreen
Works
Multimedia
3D Acceleration
Works
Audio
Audio playback, microphone, headset and buttons.
Broken
Camera
Broken
Connectivity
WiFi
Broken
Bluetooth
Broken
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Untested
USB OTG
USB On-The-Go or USB-C Role switching.
Broken
Sensors
Ambient Light
Measures the light level; used for automatic screen dimming in many interfaces.
Broken

Contributors

Users owning this device

  • R0rt1z2 (Notes: Unlocked with amonet)


How to enter flash mode

Your bootloader must be unlocked using amonet.

Note Due to the nature of the bootloader unlock, only 1 GB of memory will be available. See #Only 1 GB of memory is available for more information.

The unlock provides a hacked fastboot mode, which is the one you must use for flashing. Stock fastboot will remain locked because of how the exploit works.

To access hacked fastboot mode, you have two options:

  • Run the boot-fastboot.sh script from the amonet package.
  • Hold the Mute button while booting, until you see => HACKED FASTBOOT mode...

To access TWRP / recovery mode, you can either:

  • Run the boot-recovery.sh script from the amonet package.
  • Press and hold Volume - and Mute while turning on the device.
Note NOTE: Because of the nature of the exploit, boot and recovery images require a microloader to be injected into the very first block. NEVER flash boot or recovery images from within the OS using tools like dd. You MUST to use either HACKED FASTBOOT mode or TWRP to flash boot and recovery images, since they'll automatially inject the microloader if required.

Installation

This device must be added to pmbootstrap before it can be installed.


Issues

Only 1 GB of memory is available

The bootloader unlock is accomplished by flashing an exploitable preloader, bootloader, and tee from the Amazon Echo Show 5 (amazon-checkers).

The preloader handles low-level hardware initialization during boot. Consequently, the preloader from the Echo Show 5 only initializes 1 GB of DRAM, which is the amount of DRAM available in the Echo Show 5.