We recommend using the OTA (Over The Air) update option of the Padfone itself, use this article only if you know what you're doing.

This article contains instructions on how to install different firmwares on your Padfone, and a list of official firmware packages, official upgrade packages and custom ROMs for the Padfone.

Full packages:
Download official full firmware packages here (Official Asus website).
Download official full firmware packages here (Removed from the Asus website).


Upgrade packages (FOTA):
BE CAREFULL! If you flash the wrong firmware upgrade, you can damage the firmware on the Padfone permanently!
Please check in your system settings which firmware version number and version region you have.

CHT - Taiwan
Firmware 9.18.8.41 to 9.20.1.22
Firmware 9.20.1.22 to 9.20.2.14
Firmware 9.20.2.14 to 9.20.4.21
Firmware 9.20.4.21 to 9.20.4.34
Firmware 9.20.4.34 to 9.20.4.40
One time update for rooters: Firmware 9.18.8.41 to 9.20.4.40
Firmware 9.20.4.40 to 10.2.0.110 (Pulled back Jelly Bean upgrade)
Firmware 9.20.4.40 to 10.2.1.9 (New Jelly Bean upgrade)
Firmware 10.2.0.110 to 10.2.1.9
Firmware 10.2.1.9 to 10.2.2.11

SG - Singapore
Firmware 9.18.8.30 to 9.20.2.14

WW - International
Firmware 9.18.8.41 to 9.20.2.14
Firmware 9.20.2.14 to 9.20.4.22
Firmware 9.20.4.22 to 9.20.4.40
One time update for rooters: Firmware 9.18.8.41 to 9.20.4.40
Firmware 9.20.4.40 to 10.2.1.9 (Jelly Bean)

CHS - China
No upgrade packages available...

RUS - Russia
No upgrade packages available...

Padfone Station firmware updates:
AsusScalerFirmwareUpdate_0x26
Notes: When using the APK file, do not remover the Padfone from the Padfone Station, it will damage teh Padfone if you do. Also, make sure to update your Padfones firmware to V9.20..1.x or later.
Important Update: A lot of people seem to have issues with this update, please take this in mind before you use this update!

Custom ROMs:
Recovery
Team Win Recovery Project Touch Recovery
ROMs
Tweaked and optimized stock ROM (by SparkyRih)
Pandora Edition (by 666dsa666)

How to install?
First, make sure you have the firmware (*.zip) file in the root of an external SD card.
Also, make sure that the Padfone is fully charged, and connected to a power source.
If you're downgrading or changing the firmware region by using a full firmware package, we would recommend using the wipe feature before you apply the update.

1. Undock the Padfone.
2. Power off the Padfone.
3. Hold down the volume down button, keep holding it, and press the power button. Now you will enter the first menu.

4. Press the power button to enter "download mode".

5. Select the second option to install from an external SD card.
6. Wait for the installation to complete, depending on the update, your device will reboot automatically, or you
have to select the reboot option manually when it appears.