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Ubiquiti PicoStation2

Supported Versions

Picostation 2s are supported by Chaos Calmer under the "ath25" target. Older versions, from Barrier Breaker and previous, referred to the chipset as "atheros".

Chaos Calmer (15.05):

Barrier Breaker (14.07):

Attitude Adjustment (12.09):


It should be possible to use the ubiquiti web interface to install the firmware binaries.

When flashing those images, the Ubiquiti web interface *may* show a warning about unsupported third-party firmware. This warning can be ignored.

Flashing via TFTP

The devices come with a handy tftp server for uploading images without a web ui (or in case of certain "bricked" states). It's the same as:, but for redundancy, the process is:


  • Ethernet cable connection between PC and NanoStation. A switched connection or a bridged connection seems to work fine.
  • Network settings of PC:
  • TFTP client on PC
  • NanoStation firmware file from Ubiquiti (not an OpenWrt image)


  1. Turn off the device
  2. Press the reset button
  3. Turn on the device
  4. Release the reset button ~10 seconds (but not longer) after turning the device on. You will know it's ready when the LEDs change.
  5. Ping If it works, you're ready to upload an image, if not, go back to step 1.
  6. tftp the image in binary mode to as 'flash_update'.

tftp> bin
tftp> put openwrt-atheros-ubnt5-squashfs.bin flash_update
Sent 1965199 bytes in 28.8 seconds
tftp> quit

or in Windows Dos prompt

tftp -i put openwrt-atheros-ubnt5-squashfs.bin flash_update

7. Signal LEDs might be blinking during the upgrade. On a Nano5L, the power lights go back and forth. 7. Wait ~7 minutes before restarting or until the power lights stop their back and forth blinking. 7. Restart. The device should be back to its old configuration (OpenWrt doesn't overwrite or modify the NVRAM settings).

8. telnet to and set a password with


Upgrading OpenWrt


If you have already installed OpenWrt and like to reflash for e.g. upgrading to a new OpenWrt version you can upgrade using the sysupgrade command line tool. It is important that you put the firmware image into the ramdisk (/tmp) before you start flashing.

LuCI Web Upgrade Process
Terminal Upgrade Process
  • Login as root via SSH on
    ssh root@
  • Use the following commands to upgrade:
    cd /tmp/
    sysupgrade -i /tmp/openwrt-15.05-ath25-ubnt2-pico2-squashfs.bin

Restore Original AirOS firmware on Nanostation

To restore original firmware back you can't use mtd or sysupgrade but you have to use tftp method.

First put Picostation in recovery mode via reset button on power on, and then flash original flash image via tftp.

Basic configuration

Basic configuration After flashing, proceed with this.
Set up your Internet connection, configure wireless, configure USB port, etc.



Instruction set: MIPS MIPS 4KC
Vendor: Qualcomm Atheros
System-On-Chip: AR2316 (MIPS)
CPU/Speed 180MHz
Flash size: 4 MiB
RAM: 16 MiB
Wireless: SoC-integrated: Atheros AR2316 2.4GHz 802.11b/g


toh/ubiquiti/picostation2.txt · Last modified: 2015/10/21 08:24 by tmomas