ASUS Transformer Prime (asus-tf201)

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Asus Eee Pad Transformer Prime
Manufacturer Asus
Name Eee Pad Transformer Prime
Codename asus-tf201
Released 2011
Category testing
Original software Android 3.2 to Android 4.1
Chipset Nvidia Tegra 3 T30
CPU Quad-core 1.3 GHz Cortex-A9
Display 1280x800 Super IPS+ LCD
Storage 32/64 GB
Memory 1 GB
Architecture armv7
Unixbench Whet/Dhry score 1208.1
USB Networking
3D Acceleration
Mobile data


  • Clamor
  • Ion Agorria

Users owning this device

  • Arufa (Notes: keyboard is broken)
  • Clamor (Notes: Postmarket OS with Grate kernel)
  • IonAgorria (Notes: PMOS Mainline - OK)
  • Jja2000 (Notes: Next mainlining target)


The first step to do anything with the device is unlocking, with this device its done by sideloading the unlock apk from ASUS and clicking a few buttons in the app. The apk can be found on the ASUS support page.

Bootloader unlock fails with Unknown error

Contact ASUS tech support, describe the issue and provide them with information they'll request. Bootloader unlock may become available within 1-2 days after the request.

Kernel status

Android kernel

Mainline (Grate)


pmOS with mate running on Prime

How to enter flash modes

Turn tablet off if it is in the system. Then press POWER and VOL DOWN buttons till you feel the vibration. Then release the POWER only. You will enter the bootloader/fastboot. In bootloader you can navigate with VOL DOWN button and to choose option use VOL UP button.

Bootloader version

Latest bootloader for TF201 was and to use pmOS you need bootloader version of to reach this you can use flashable via TWRP bootloader packages.

Installation process

The bootloader doesn't handle flashing the boot and userdata partition correctly, the official firmware package flashes an "Android blob" to the staging partition with fastboot which triggers an flashing screen on the tablet which copies the data to the correct partitions. pmbootstrap has tools to pack and flash kernel correctly, no worries!

Preparing rootfs and flashing kernel:

1 $ pmbootstrap init
2 $ pmbootstrap install
3 $ pmbootstrap flasher flash_kernel

Flashing rootfs

This may change size of your data partition. You can fix it by resizing partition in TWRP before flashing Android.

You should proceed very carefully here.

When rootfs is larger than approx. 800 MB you can flash it to the /userdata partition ONLY, if rootfs is smaller, you can flash it to /system or /userdata.

Prerequisites: TWRP, at least version 3.3.1-0, binaries for bootloader are here.

First, start TWRP (go to bootloader and choose RCK) and then continue with these instructions

1 (computer) $ pmbootstrap export
2 (computer) $ adb shell
3 (twrp) $ umount /dev/block/mmcblk0p1 <- unmounting /system partition
4 (twrp) $ umount /dev/block/mmcblk0p8 <- unmounting /data partition
5 (computer again) $ adb push /tmp/postmarketOS-export/asus-tf201.img /dev/block/mmcblk0p1 <- to flash rootfs to /system partition
6 'OR'
7 (computer again) $ adb push /tmp/postmarketOS-export/asus-tf201.img /dev/block/mmcblk0p8 <- to flash rootfs to /data partition

Hardware status (mainline)

Status Hardware Info
Y Booting boot.img has restriction of approx 8MB, which is /boot partition size.
Y Panel HannStar HSD101PWW2 Rev0-A00/A01 LCD SuperIPS+ HD panel through LVDS controller.
Y HDMI output HDMI works, but output is 1080p due to Tegra 3 limitations.
Y Touchscreen Used Atmel MXT768E touchscreen.
Y USB One full size USB 2.0 in dock or via 40pin adapter.
Y SD cards MicroSD card and full sized SD card (recognized as USB drive) in dock.
Y Internal memory eMMC by Kingston KE4BT5D6A or Hynix H26M64002BNR.
P GPS Broadcom GPS BCM4751 is used. Device tree has proper bindings but device itself has weak signal.
Y WiFi Uses Azurewave AW-NH615 BCM4329. Wi-Fi should work out of the box. All needed stuff is included.
Y Bluetooth Uses Azurewave AW-NH615 BCM4329B1. Works fine out of the box.
Y GPIO keys There are 3 keys on GPIO: Power, Volume up, Volume down.

Additionally GPIO-keys like are LID sensor and Audio dock line-out detect.

Y Vibro Transformer Prime has GPIO based vibrator.
Y Dock Keyboard Both pad and dock have Nuvoton NPCE795LA0BX embedded controller which handles battery data, charding, leds, keyboard and touchpad. Driver of this EC is mainlined and is fully functional. Keyboard and Touchpad work.

Alt Gr can be used for alternate multimedia keys instead of escape, fn keys, volumes and delete. Alt GR + Lock changes the default key mode.

Y Battery/Charger Driver is based on Texas Instruments bq24725 SMBus Charge Controller driver and GPIO charger but works through pad/dock EC. Charging and charge level of both batteries are shown correctly.
Y PMIC Transformers use Texas Instruments TPS659110 PMIC and TPS62361 core regulator.
Y Sound Sound codec is RT5631. Kernel driver and tegra_rt5631 glue driver are added to grate master. Sound works out of the box, ALSA configuration file is included into device package.
N Voice processor Transformers use separate Fortemedia FM34NE voice processor. No mainline driver is available. Is used for voice processing and noise cancelling. Currently not used.
Y Thermal sensor NCT1008 ON Semiconductor LM90 series thermometer.
Y Orientation sensors Include Invensense mpu3050 gyroscope with Kionix KXTF9 accelerometer and Aichi AMI306 3-axis digital compass.
Y Light sensor Driver Dyna-Image AL3010. Brightness regulation works, install iio-sensor-proxy . It's slightly oversensitive.
N Front camera Aptina mi1040 camera sensor. Grate kernel doesn't support VI yet. Mainline linux driver exists (authored by Okias) and proper nodes are added to device tree.
N Rear camera Fujitsu MBG048 image processor. Since it is broken on most TF201 is not planned to be added to support list. If you have such a need, development is welcome. Mainline driver doesn't exist.
P ULP GeForce GPU Acceleration partially works.

See also