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Xiaomi Redmi 4A (xiaomi-rolex)

From postmarketOS Wiki
Note This device is supported as part of a generic port. Refer to Generic MSM89x7 (qcom-msm89x7) for installation instructions and more information.
Xiaomi Redmi 4A
Manufacturer Xiaomi
Name Redmi 4A
Codename xiaomi-rolex
Released 2016
Type handset
Hardware
Chipset Qualcomm Snapdragon 425 (MSM8917)
CPU Quad-core 1.4 GHz Cortex-A53
GPU Adreno 308
Display 720 x 1280 pixels, 16:9 ratio (~296 ppi density) IPS LCD capacitive touchscreen, 16M colors
Storage 16 GB
Memory 2 GB
Architecture aarch64
Software
Original software
The software and version the device was shipped with.
Android (MIUI) 6.0.1 (MIUI 10)
Extended version
The most recent supported version from the manufacturer.
Android (MIUI)
postmarketOS
Category testing
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.
6.15
Generic port Generic MSM89x7 (qcom-msm89x7)
Device package device-qcom-msm89x7
Kernel package linux-postmarketos-qcom-msm89x7
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, ...
Works
SD card
Also includes other external storage cards
Works
Battery
Charging and battery level reporting works
Broken
Screen
Display works. Ideally with sleep mode and brightness control.
Works
Touchscreen
Works
Multimedia
3D Acceleration
Works
Audio
Audio playback, microphone, headset and buttons.
Works
Camera
Partial
Connectivity
WiFi
Works
Bluetooth
Works
GPS
Works
Modem
Calls
Partial
SMS
Works
Mobile data
Works
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Works
USB OTG
USB On-The-Go or USB-C Role switching
Broken
Sensors
Accelerometer
Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile
Works
Magnetometer
Sensor to measure magnetism
Partial
Ambient Light
Broken
Proximity
Partial
Haptics
Works


Contributors

  • Nrdnandan

Maintainer(s)

  • Nrdnandan

Users owning this device


Models

Model number Market/Operator LTE Bands
2016111 PRC/China Telecom 1, 3, 7, 38, 39, 40, 41
2016112 PRC/China Telecom 1, 3, 7, 38, 39, 40, 41
2016117 RoW 1, 3, 4, 5, 7, 8, 20, 40, 41

Hardware

To check the hardware configuration of your device using the stock MIUI ROM:

1. Go to Setting

2. Go to About Phone

3. Tap Kernel Version 5 times

4. Click Device View

or simply dial *#*#6484#*#* then click Device View

Displays:

Panel/Driver Status
EBBG/Novatek NT35521s (c3a) Works
EBBG/Ilitek ILI9881C Works
BOE/Himax HX8394-F Works

Touch Panels:

Model (Vendor, FW) Status
FocalTech FT5435 (O-film, FW 0x10) Broken
GOODiX GT911 Works

Cameras:

Type Sensor/Vendor Status
Back Samsung/O-film S5K3L2 Broken
Back OmniVision OV13850 Broken
Front Samsung/O-film S5K5E8 Broken
Front OmniVision/O-film OV5675 Works

Sensors (information about the models was obtained by AIDA64 app):

Type Model Status
Accelerometer + Gyroscope Bosch BMI160 Works
Ambient Light + Proximity Liteon Opto LTR55X Broken
Magnetometer Yamaha YAS537 Partial

Modem

Modem needs manual steps Qualcomm_Snapdragon_425/427/430/435_(MSM8917/MSM8920/MSM8937/MSM8940)#Modem

How to enter into bootloader (fastboot)

  • Shutdown the phone completely.
  • Press Volume Down and Power button simultaneously to enter fastboot mode.

How to enter into recovery mode

  • Shutdown the phone completely
  • Press Volume Up and Power button simultaneously to enter the recovery (MI or Custom).

Installation

Note Warning: Flashing lk2nd is required, as it is a hard dependency. Without it the mainline kernel will not select the display panel (resulting in black screen on boot).
$ pmbootstrap init # choose Vendor: qcom Device codename: msm89x7
$ pmbootstrap install
$ fastboot flash boot lk2nd.img # Build lk2nd from msm8916-mainline/lk2nd repo
$ pmbootstrap flasher flash_rootfs

Bootloader original status

See Also