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Lenovo ThinkPad Tablet

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Lenovo ThinkPad
Lenovo ThinkPad.jpg
Model Number: A400
Device Type: Tablet
Manufacturer: Lenovo Lenovo-icon.png
Release Date: Aug. 2011
Operating System: Android Android-icon.jpg
Dimensions: 260.4 x 181.7 x 14 mm
Weight: 715g WiFi, 730g 3G
Display: 10.1" WXGA 1280 x 800 LCD
Chipset: Nvidia Tegra 2 T20
Internal Memory: 16/32/64GB NAND
Memory Card: SD, SDHC
Networks: Wifi, 3G
Wi-fi: 802.11 b/g/n 2.4 GHz
USB: 1x Type A Female USB 2.0
Bluetooth: 2.1 + EDR
GPS: Yes
Video out: microHDMI
Camera: 5MP
Secondary Camera: 2 MP
Battery: Li-ion
Other features
Additional Features: USB2.0 host


Welcome to the Lenovo ThinkPad Tablet XDA Wiki page. This can be edited by any member so if you do, please keep it tidy.

  • Add any info you feel can be helpful for others.
  • If you have created a ROM then add it to the list.
  • If you have written a handy guide or can link someone else's here, please do.


  • Operating System: Google Android 4.0.3
  • Processor: NVIDIA® Tegra™ 2 T20 1.0GHz dual-core CPU
  • Display: 10.1" IPS (1280x800) Multi-touch input w/ Gorilla Glass
  • Memory: 1024MB RAM, 16/32G/64B Internal Storage, Expandable with SD Cards
  • Connectivity: WLAN 802.11b/g/n (2.4Ghz) , Bluetooth v2.1 + EDR, 3G (on some models)
  • Dimensions: 260.4 x 181.7 x 14 mm
  • Weight: 715gm WiFi, 730gm 3G
  • Battery: 8.7hours with WiFi, 7hours with 3G)
  • 3G Support (Optional): Ericsson card or Gobi card.
  • Video output: HDMI mini port

General Info

Product Numbers: 1838, 1839


Mobile Broadband Network Adapters

The Thinkpad Tablet may come or not with a Mobile Broadband Network adapter (3G Modem) depending on the model. But every tablet has the SIM port on the bottom part.

Check the page 59 of the Maintenance Manual for FRUs and Information. [1]

Ports Available

The Lenovo Thinkpad Tablet has the following ports:

  • Bottom
    • Thinkpad Tablet Replication Port
    • Micro USB Port
    • Mini HDMI Port
    • Audio/Mic plug port
    • SD Card port
    • SIM card port

Lenovo Thinkpad Tablet 4.JPG SD card and SIM port.png Bottom-Ports-1.JPG

  • Side
    • Full USBV2 Port

Replication Port


XDA Forums

Lenovo Forum


Android system recovery <3e>

Android system recovery <3e> is the default recovery system that came with the Thinkpad Tablet. To access it follow the next instructions:

  • Shut down your TPT by pressing and holding the power button
  • Press and hold the power button until the TPT vibrates
  • Keep pressing releasing the volume up button until you see "Booting Recovery Kernel Image" in the upper left corner. It seems that getting the recovery option is all about the timing of when the button is pushed. I get it every time on the second button push, your mileage may vary
  • You will get a screen that says:
Android system recovery <3e>
Android system recovery utility

with these selectable options

reboot system now
apply update from external storage
wipe data/factory reset
wipe cache partition

At this point the power button is your enter key and the volume up and down are your selection keys.

CWM Recovery

ClockworkMod Recovery (CWM) is a replacement recovery option for Android devices. CWM for ICS Thinkpad Tablet is available [2]



  1. Make sure the device is turned off and disconnect it from PC.
  2. Hold the "Rotation button" and press the "Power button" for approximately 2 seconds.

The device will turn on in APX-Mode. You won't see anything on the screen, the display does not turn on.

If you connect the USB cable to a Windows PC, Windows will recognize it as an APX device.


On this mode you can use nvflash tool.

Locked Bootloader

There had been some discussion on the xda-forums if this tablet's bootloader is locked or not. There seems to be models that are not locked and allows the use of nvflash. Some other models has the bootloader locked and nvflash can not be loaded.

Locked Bootloader Syndrome

The booloader seems to be locked when you turn the tablet on APX-Mode and have it connected to a PC. When you send a nvflash command, the device seems to be disconnected from the PC and nvflash can not execute the action.

There had been requests and complains to Lenovo to release the Secure Boot Key (SBK) codes to unlock APX mode:

  • [Petition Please Unlock the Bootloader of TPT]

Getting root access

It is possible to obtain root access on this device:

Recovering Thinkpad Tablet partitions

If you bootloader is not locked and you can use NVFlash on the Thinkpad tablet, you can recover the partitions with this tutorial posted on the XDA Forums

Roms Available

  • [ROM[CM10] Thinkpad Tablet (v.0.9.2)] - Updated: 8th February 2013 - by Koshu


The current kernel version is

The latest Lenovo builds/images were released for OTA3.5 update on 2012-08-27 and named ThinkPadTablet_A400_03_0070_0132_xxx

xxx represents the TPT's regional code: JP (Japan) SC (Singapore and China?) UK (United Kingdom) US (United States) WE (Western Europe) ROW (Rest Of the World)

Bricked Device

This are the possible bricks of this device:

Lenovo Animation Loop

There is a common problem on the tablet that the tablet boot process stuck on the Lenovo animation, and the animation just keep running indefinitely.

Possible Solution:

One possibility is to perform a Factory Reset on the Thinkpad Tablet. This will erase all the data stored in your tablet.

If after the Factory Reset, the device keep looping you can try to load an image via the "Recovery Menu". Lenovo's Thinkpad Tablet images are located here (Please notice there are different versions according to the geographical location)

Possible Solution 2:

aliakg56 posted a tutorial how to fix the tablet boot loop:

But the Thinkpad Tablet Bootloader (APX mode) needs to be unlocked so you can send commands with nvflash.exe.

Lenovo Static Logo Freeze

This is when the Thinkpad Tablet freezes on the static Lenovo logo, the first that shows, and do not advance to the animation.

Static Lenovo Logo.JPG

Possible Solution:

  • Possibility 1: With CWM (rooted) Tablet: [3], [4]

  • Possibility 2: With an un-rooted without CWM installed Tablet: Perform a Factory Reset

  • Possibility 3: With an un-rooted without CWM installed Tablet: If the factory reset does not work. Unknown Solution.

"Booting Recovery Kernel Image" Freeze

On other kind of brick on this device is that when turning the tablet on, will show the static Lenovo logo. If you turn it on "recovery mode" (Power on button+Volume up) it will freeze while showing the static Lenovo Logo and a message on the right top saying "Booting Recover Kernel Image".

Recovery - Boot-Marked.png

Possible Solution:

  • Possibility 1: If you bootloader is locked there is yet not way to recover from this brick. We need that Lenovo releases the Secure Boot Key (SBK) to unlock this tablet. (11:18, 17 March 2013 (CDT))
  • Possibility 2: If you bootloader is not locked, there had been discussion how to recover from this brick (and wipe the partition) using nvflash. [5]

Recovery Menu showing errors

When accessing the "Recover Mode" (Power on button+Volume up) to do a factory reset, it will load into the "recovery meny" but it will show you several errors like:

E:Can't open /dev/block/mmcblk0p5
(no such file or directory)
E:failed to mount /cache (no such file or directory)
E:failed to mount /cache/recovery/last_log

TPT error recovery.jpg

Possible Solution:

  • Possibility 1: If you bootloader is locked there is yet not way to recover from this brick. We need that Lenovo releases the Secure Boot Key (SBK) to unlock this tablet. (11:18, 17 March 2013 (CDT))
  • Possibility 2: If you bootloader is not locked, there had been discussion how to recover from this brick (and wipe the partition) using nvflash.

Hardware Issues

Some of the common hardware issued with the Thinkpad Tablet device are:

Battery not Charging

There had been several posts on the Lenovo's forum about problems with the battery of this tablet. But some of the problems may not be battery related at all.

Here are some tips:

1.- Be sure that you are using the charger that came with the Tablet to charge it. Some micro-USB generic chargers do not work with this tablet. When your tablet is power off and it is charging it will show for some 5 seconds the following image:


2.- It is always a good alternative to try the "Thinkpad Tablet Dock" to charge it (it charges faster), or even trying to build your own dock charger

3.- Check that is not a problem with the power on button that is very prone to break.

4.- Check that the micro-usb port is not broken.

Slow battery Charging

On the Thinkpad Tablet there is the issue that the MicroUSB port charges the device very slowly, specially with the tablet turned on.

Workaround 0

Check that you are using the original Lenovo charger that came with the tablet. Others USB chargers do not provide enough power to charge it.

Workaround 1

Buy a $20 Thinkpad Tablet dock that will charge the device faster. (Sorry, out of stock)

Workaround 2

Build combodock port charger

Broken Power Button

The power button had also been one of the common things that got broken on this tablet.

The symptoms are:

  • Thinkpad tablet won't turn on.
  • Thinkpad tablet won't wake up.
  • Problems powering up the device.


Workaround 1

If the power button has broken Lenovo has a Button Kit FRU.

The FRU is 04W2155 [6]

  • It seems that FRU:04W2155 had been replaced by FRU:63Y1860

FRU63Y1860 01.JPG

FRU63Y1860 02.JPG

Workaround 2

There is a guide that can give you hint on how to re-enforce the button, but this is something you can do before the problem happens. [7]

FRU63Y1860 03.JPG


Broken micro USB Device

Something that commonly broke on this device is the Micro USB port. Sometimes you have to slightly press up on the cord to make it charge, or sometimes it breaks completely.

Workaround 1

Buy a Thinkpad Tablet 1 Dock (Which seems to be hard to get this days) that will charge the device faster. Or you can try building your own "Dock port power Adapter" for this tablet.

Workaround 2

There are some comments online on how to try to repair the Micro USB (German only).

Touch Screen not Working

Issue: If you experience that the touch screen is not working, everything boots ok, a mouse on the USB port works, but the finger does not interact with the touch screen.

Workaround 1

Possible you activated the "Pen Only" function which it stops the touch screen working with the finger and you can only interact with the Pen. If you have a pen try to disable this function, or use an external USB mouse to disable it.

Pen Not Working

Issue: The pen does not interact.

Workaround 1

Some of us we are used to Wacom pens which does not uses batteries. The Thinkpad Tablet 1 Pen, made by Ntrig, has a AAAA battery inside that requires to be replaced some times.

Extended Coverage by Lenovo

Lenovo offered extended coverage for the Lenovo Thinkpad Tablet 1 owners that has issues doing a Factory Recovery and show errors on the Android Recovery Menu.

But this coverage was only available until August 31 of 2014.

You needed to contact your "Lenovo support in your country for assistance" or if you have problems getting the extended coverage, send a personal message to Mark on the Lenovo forum. Please check the last post on this Lenovo forum thread.


Lenovo Tablet Pen

Tp tab pen 0a33887.jpg

The pen uses an 1 AAAA battery inside. The red cap gets unscrewed to put the battery from that side of the pen.

Tp tab pen2.jpg

The pen technology was developed by N-Trig. There is news release about n-trig collaborating with Lenovo for this pen on the Thinkpad Tablet 1.

Lenovo Tablet Keyboard Folio

Lenovo tablet Keyboard Folio.jpg

Lenovo tablet Keyboard Folio -2.jpg

The mouse may look like a Thinkpad Trackpoint, but it is not. It is a digital optical mouse.

Lenovo Tablet Dock

Lenovo Thinkpad Tablet 2.JPG

It has on the back:

  • Micro USB Port.
  • 65W/20V Thinkpad power adapter port.
  • Audio/headphones output port.
  • Microphone input port.

TPTablet Dock 1.JPG

On the side it has one full size USB port.

TPTablet Dock 2.JPG

It connects to the tablet with the dock port. It only supports the tablet on a vertical position.

Thinkpad Tablet Folio Case

Thinkpad tablet folio case.jpg

China's Micro HDMI to VGA Adapter (non-Lenovo)

  • eBay
  • Aprox Price: $15.00


This device was tested with the Thinkpad Tablet and worked without issues. It is a generic Micro HDMI to VGA converter.

Custom Made 20V Charger

This is a custom made charger to use a Thinkpad laptop adapter to charge the TPT1 using the Dock port.

Check its pictures at: [9]

More information at Lenovo's Forum posts [10].

Source Code

Lenovo released the source code of the Thinkpad Tablet for the components that are Open Source on 2012. Check it's support website. (198MB)

Further Information

The newest version was A400_03_0070_0132_XXX

Download can be made at :



  • [nvflash A very powerfull tool] - Good thread that talk about nvflash on Thinkpad Tablet.