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Samsung Galaxy J8 2018 (samsung-j8y18lte)

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Samsung Galaxy J8 (2018)
Samsung Galaxy J8 (2018) with GNOME
Samsung Galaxy J8 (2018) with GNOME
Manufacturer Samsung
Name Galaxy J8 (2018)
Codename samsung-j8y18lte
Released 2018
Type handset
Hardware
Chipset Qualcomm Snapdragon 450 (MSM8953)
CPU Octa-core 1.8 GHz Cortex-A53
GPU Adreno 506
Display 720 x 1480 (5.9", AMOLED)
Storage 32/64 GB
Memory 3/4 GB
Architecture aarch64
Software
Original software
The software and version the device was shipped with.
Android 10
Extended version
The most recent supported version from the manufacturer.
Android
postmarketOS
Category downstream
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
no
Device package device-samsung-j8y18lte
Kernel package linux-samsung-j8y18lte
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
Battery
Whether charging and battery level reporting work.
Works
Screen
Whether the display works; ideally with sleep mode and brightness control.
Works
Touchscreen
Works
Multimedia
3D Acceleration
Broken
Audio
Audio playback, microphone, headset and buttons.
Broken
Camera
Broken
Connectivity
WiFi
Works
Bluetooth
Broken
GPS
Untested
NFC
Near Field Communication
Broken
Modem
Calls
Untested
SMS
Untested
Mobile data
Untested
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Works
USB OTG
USB On-The-Go or USB-C Role switching.
Works
Sensors
Accelerometer
Handles automatic screen rotation in many interfaces.
Works
Magnetometer
Sensor to measure the Earth's magnetism
Broken
Ambient Light
Measures the light level; used for automatic screen dimming in many interfaces.
Broken
Proximity
Broken
Hall Effect
Measures magnetic fields; usually used as a flip cover sensor
Works


Users owning this device

  • Erfto1 (Notes: SM-J810F - Boots)
  • Lucasredelive (Notes: SM-J810M - STOCK ROM - abandoned mainline)

How to enter flash mode

  • Recovery: Power on the device by holding Volume Up and Power.
  • Download: Hold Volume Up and Volume Down while plugging the device to a computer with an USB cable.

Unlocking the bootloader

  1. Enable developer mode by tapping on the build number seven times in Settings → About phone → Software information
  2. Return to the main settings page and go to the developer options
  3. In developer options, enable OEM unlocking. Make sure you have an internet connection if it doesn't show up.

Installation

  1. Unlock the bootloader if not done.
  2. Select j8y18lte and Gnome UI with pmbootstrap init
  3. Generate the rootfs with pmbootstrap install to install postmarketOS to the phone or pmbootstrap install --sdcard /dev/sdX to install it on an SD card.
  4. Generate the flashable images with pmbootstrap export. They will be stored in /tmp/postmarketOS-export, or you can specify another location like this: pmbootstrap export /home/user/Downloads/pmos
  5. Reboot into download mode
  6. Flash postmarketOS with heimdall flash --BOOT /tmp/postmarketOS-export/boot.img --SYSTEM /tmp/postmarketOS-export/samsung-j8y18lte.img (replace the paths if necessary). If you installed to an SD card, specify only the BOOT argument. Also you may choose the bigger USERDATA partition for the system image.
  7. The phone should reboot straight into postmarketOS.

See also