Ubiquiti PicoStation M2

This device is NOT RECOMMENDED for future use with OpenWrt due to low flash/ram.
DO NOT BUY DEVICES WITH 4MB FLASH / 32MB RAM if you intend to flash an up-to-date and secure OpenWrt version onto it! See 4/32 warning for details.

1) This device does not have sufficient resources (flash and/or RAM) to provide secure and reliable operation.
This means that even setting a password or changing simple network settings might not be possible any more, rendering the device effectively useless. See OpenWrt on 4/32 devices what you can do now.

2) OpenWrt support for this device has ended in 2022.
19.07.10 was the last official build for 4/32 devices.

Brand	Model	Version	Current Release	OEM Info	Forum Topic	Technical Data
Ubiquiti	PicoStation M2HP		19.07.10			View/Edit data

Model	Version	SoC	CPU MHz	Flash MB	RAM MB	WLAN Hardware	WLAN2.4	WLAN5.0	100M ports	Gbit ports	Modem	USB
PicoStation M2HP		Atheros AR7240	390	8	32	Atheros AR7240	b/g/n	-	1		-	-

Model	Version	Current Release	Firmware OpenWrt Install	Firmware OpenWrt Upgrade	Firmware OEM Stock
PicoStation M2HP		19.07.10	https://downloads.openwrt.org/releases/19.07.10/targets/ar71xx/generic/openwrt-19.07.10-ar71xx-generic-ubnt-bullet-m-squashfs-factory.bin	https://downloads.openwrt.org/releases/19.07.10/targets/ar71xx/generic/openwrt-19.07.10-ar71xx-generic-ubnt-bullet-m-squashfs-sysupgrade.bin

→ Install OpenWrt (generic explanation)

Picostation M2 device uses Bullet M2 firmware image

WARNING

airOS firmware versions >5.6 have a new bootloader with an incompatible partition table!

If you install OpenWrt over these versions, all will seem well, but your configs will not persist after reboot.

To avoid this issue:

reset Picostation
install the latest version of airOS XM 5.6.3
then downgrade to airOS XM 5.5.11 through the airOS web GUI
reset Picostation
tftp your openwrt bin

If you do not do this, and instead attempt to install openwrt over the top of airOS >5.6 and then, realising your mistake, attempt to downgrade to ≤ 5.5, you will find your device soft-bricked, stuck in a boot loop. This is because the TFTP flashing procedure does not overwrite the bootloader, leaving you with a 5.6 bootloader trying to load a 5.5 firmware, which wont work. Attempts to TFTP other openwrt versions at this point will simply be rejected by the tftp server.

If you find yourself in this situation, you will need to access the serial console using a TTY cable as described here: https://community.ubnt.com/t5/airOS-SDK-Custom-Development/AirMAX-Device-Firmware-Recovery-Procedure/td-p/1499583

The above url details a procedure which can be carried out using the tty console which will allow reflashing the entire image, including the bootloader.

The instructions are mirrored here in case the ubnt forum disappears: http://pastebin.com/raw/FLjgY074

More information is available in the following threads:

https://community.ubnt.com/t5/airOS-Software-Configuration/Cannot-downgrade-firmware-from-5-6-3/td-p/1450154 https://community.ubnt.com/t5/airOS-SDK-Custom-Development/5-6-2-TFTP-ERROR/td-p/1307614 https://community.ubnt.com/t5/UniFi-Wireless/HOWTO-Unbrick-your-UniFi-AP/td-p/338684

The OpenWrt buildroot generates images that can be directly flashed to the Picostation M2 trough the Ubiquiti web, usually with a name like openwrt-ar71xx-generic-ubnt-bullet-m-squashfs-factory.bin (image for Ubiquiti Bullet M2).

Picostation M2 as node on SECN (batman-adv) network

How to add tags

ath79, AR7240, 8Flash, 32RAM, 1port, fastethernet, 1wnic, 802.11bgn, Outdoor, PoE

ath79 ar7240 8Flash 32RAM 1port fastethernet 1wnic 802.11bgn Outdoor PoE

Ubiquiti PicoStation M2

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