[bielefeld] Fwd: [ffj] Fwd: [Battlemesh] Don't flash from AirOS 5.6.X to OpenWRT

[Moritz Warning]

-------- Forwarded Message --------
Subject: [ffj] Fwd: [Battlemesh] Don't flash from AirOS 5.6.X to OpenWRT
Date: Thu, 31 Dec 2015 19:35:11 +0100
From: Micha Stöcker <micha at stoecker.me>
Reply-To: Freifunk Jena <ffj at freifunk-jena.de>
To: Freifunk Jena <ffj at freifunk-jena.de>

Achtung, wer neue Ubiquity-Geräte hat oder in letzter Zeit seine AirOS
geupdatet hat sollte hier wenn ich das richtig verstehe keinesfalls
OpenWRT flashen, sonst habt ihr einen Briefbeschwerer.


-------- Weitergeleitete Nachricht --------
Date: Thu, 31 Dec 2015 17:07:29 +0100
Subject: [Battlemesh] Don't flash from AirOS 5.6.X to OpenWRT


From AirOS 5.5.X to 5.6.X the size of memories on the flash changes so
that flashing OpenWRT (or other non AirOS firmwares) bricks the device.

From https://wiki.openwrt.org/toh/ubiquiti/airmaxm

"Special Firmware Note: AirOS XM.v5.5.X images used U-Boot 1.1.4.2-s594
(Dec 5 2012 - 15:23:07). The OpenWRT image can be successfully flashed
onto these versions of firmware. However, in July 2015 Ubiquiti released
a new version of firmware XM.v5.6.X. With this firmware a new U-Boot
version was released, U-Boot 1.1.4.2-s956 (Jun 10 2015 - 10:54:50). The
newer U-Boot version changes the memory size and starting address for
rootfs, cfg, and EEPROM. LOADING AN OPENWRT IMAGE ON A U-Boot
1.1.4.2-s956 WILL CAUSE THE DEVICE TO BE BRICKED!!!

If the device has XM.v5.6.X, an older version of XM firmware can be
loaded from the AirOS webgui (for example XM.v5.5.10) and U-Boot will be
overwritten with the older version. OpenWRT can then be loaded onto the
device successfully."

Anyway if you know a way for un-bricking such devices let me know, as I
have 4 devices bricked this way :/

There's also a bug report on this problem
https://dev.openwrt.org/ticket/20982

Bye,
Ilario





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