Samsung Galaxy J4+ (samsung-j4primelte)

Features
Flashing 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).	Broken
Battery Charging and battery level reporting works	Untested
Screen Display works. Ideally with sleep mode and brightness control.	Broken
Touchscreen	Untested
Multimedia
3D Acceleration	Untested
Audio Audio playback, microphone, headset and buttons.	Untested
Camera	Untested
Connectivity
WiFi	Untested
GPS	Untested
Modem
Calls	Untested
SMS	Untested
Mobile data	Untested
Miscellaneous
FDE Full disk encryption and unlocking with unl0kr.	Untested
Sensors
Accelerometer Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile	Untested

Samsung Galaxy J4+
	; J4+ booting into postmarket OS
Manufacturer	Samsung
Name	Galaxy J4+
Codename	samsung-j4primelte
Released	2018
Type	handset
Hardware
Chipset	Qualcomm Snapdragon 425 (MSM8917)
CPU	1.4 GHz Quad-core Cortex-A53
GPU	Adreno 308
Display	720x1480 IPS
Storage	16/32 GB
Memory	2/3 GB
Architecture	aarch64
Software
Original software	Android
Original version The version the device was shipped with.	8.1
Extended version The most recent supported version from the manufacturer.	9.0
postmarketOS
Category	testing
Pre-built images Whether pre-built images are available here.	no

Contributors

1. power off the device.

2. press and hold the power button and both sound buttons

3. at the blue screen press the upper sound button

There is a problem with the graphics driver, that affects both the J4+ and the J6+. A mainline kernel is most likely needed to fix this issue.