LG Fx0 (lg-madai)

Features
Flashing	Works
USB Networking	Works
Internal storage
SD card
Battery	Works
Screen	Works
Touchscreen	Works
Multimedia
3D Acceleration
Audio
Camera
Camera Flash
Connectivity
WiFi	Partial
Bluetooth
GPS
NFC
Modem
Calls
SMS
Mobile data
Miscellaneous
FDE
USB OTG
Sensors
Accelerometer
Magnetometer
Ambient Light
Proximity
Hall Effect
Haptics
Barometer

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	2.0
FOSS bootloader	no
postmarketOS
Category	testing
Pre-built images	no
postmarketOS kernel	3.4.0
Unixbench Whet/Dhry score	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

The LG download mode is disabled by default. See the Installation section below for enabling it.

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