LG Fx0 (lg-madai)

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).	Works
Internal storage eMMC, SD cards, UFS, ...	Untested
SD card Also includes other external storage cards	Untested
Battery Charging and battery level reporting works	Works
Screen Display works. Ideally with sleep mode and brightness control.	Works
Touchscreen	Works
Multimedia
3D Acceleration	Untested
Audio Audio playback, microphone, headset and buttons.	Untested
Camera	Untested
Camera Flash	Untested
Connectivity
WiFi	Partial
Bluetooth	Untested
GPS	Untested
NFC Near Field Communication	Untested
Modem
Calls	Untested
SMS	Untested
Mobile data	Untested
Miscellaneous
FDE Full disk encryption and unlocking with unl0kr.	Untested
USB OTG USB On-The-Go or USB-C Role switching	Untested
Sensors
Accelerometer Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile	Untested
Magnetometer Sensor to measure magnetism	Untested
Ambient Light	Untested
Proximity	Untested
Hall Effect Also known as flip cover sensor	Untested
Haptics	Untested
Barometer Sensor to measure air pressure	Untested

LG Fx0
	; LG Fx0 running Xfce4
Manufacturer	LG
Name	Fx0
Codename	lg-madai
Model	LGL25
Released	2014
Type	handset
Hardware
Chipset	Qualcomm Snapdragon 400 (MSM8926)
CPU	4x ARM Cortex-A7
GPU	Adreno 305
Display	720x1280 TFT
Storage	16 GB
Memory	1.5 GB
Architecture	armv7
Software
Original software	Firefox OS
Original version The version the device was shipped with.	2.0
FOSS bootloader	no
postmarketOS
Category	testing
Pre-built images Whether pre-built images are available here.	no
pmOS kernel The kernel version that runs on the device's port.	3.4.0
Unixbench score Unixbench Whetstone/Dhrystone score. See Unixbench.	890.1

LG Fx0, also known as LGL25, is a smartphone manufactured by LG Electronics. Fx0 was originally available only in Japan, sold by KDDI. The hardware is similar to LG G2 mini (lg-g2m) while Firefox OS is pre-installed instead of Android.

There are two known versions of Fx0. The original, SIM-locked and non-rooted version was available from the official sales channel. Later, the SIM-free and rooted version appeared in aftermarket. The rooted (SIM-free) version is strongly recommended if you try postmarketOS on Fx0.

Contributors

peremen
MasanoriOgino

Users owning this device

MasanoriOgino (Notes: 2x)

How to enter flash mode

To enter the LG download mode, unplug the device from the USB, power off, and hold Volume Up while connecting to the USB [1]. You will see the DOWNLOAD MODE line if succeeded.

If lk2nd is installed, hold Volume Down while booting to enter fastboot mode. Note that you can enter the LG download mode even if lk2nd is installed.

Installation

You need to erase the LAF partition to enable the LG download mode. Given that there is no KDZ or TOT file for this device available, it does not make sense to keep the LAF partition for flashing.

To backup the LAF partition, you need a working su on the device. On adb shell:

$ su
# dd if=/dev/block/platform/msm_sdcc.1/by-name/laf of=/sdcard/laf.img
# dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/laf

Then, on the host:

$ adb pull /sdcard/laf.img

Now, you can enter the LG download mode. While it provides some fastboot commands, it is unstable and lacks important features. lk2nd provides a more stable and full-fledged fastboot implementation. Download lk2nd-msm8226.img from the latest release of lk2nd.

We recommend to backup the boot partition before installing lk2nd.

$ # On adb shell:
$ su
# dd if=/dev/block/platform/msm_sdcc.1/by-name/boot of=/sdcard/boot.img
$ # On the host:
$ adb pull /sdcard/boot.img

Then, enter the LG download mode and flash lk2nd.

$ fastboot flash boot lk2nd-msm8226.img
$ fastboot reboot

You should backup the system and userdata partitions, at least.

$ fastboot fetch system system.img
$ fastboot fetch userdata userdata.img

Read and follow the general installation guide to continue installation.

Components

UART: According to service manual UART is provided as a part of JTAG connector, unpopulated by default and only accessible after opening the case. The Pin 14 (lower right, bigger pad than others) is MSM_UART_TX, which needs to be hooked up to the RX of the UART adapter.
Wi-Fi: Qualcomm WCNSS. Note that the LG source code archive lacks the prima driver, which is used in Firefox OS. According to dmesg in Firefox OS, it is version v3.2.3.172. Porting the prima driver from LineageOS kernel makes Wi-Fi work, but it seems that NetworkManager seems not like this configuration.
Display: no backlight adjustment yet, also had to change the visual to RGB565 to get a working Xfce4.
Given the sorry quality and lower version of stock LG kernel, maybe mainlining could be worth?

Contributors

Users owning this device

How to enter flash mode

Installation

Components

See also