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/usr/share/doc/ap-utils/HARDWARE-NOTES is in ap-utils 1.5-2.

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Tellus A14 and its clones - IMPORTANT, READ CAREFULLY:
======================================================
Users of Tellus A14 and its OEM versions (Wline A14): Beware.
The firmware 0.2.2.11 contains a SERIOUS BUG that may cause unpredictable
damage, when the AP is configured over SNMP or even via its web interface,
no matter if the manufacturer-recommended 0.0.1.15 version of SNMP
manager, or AP-UTILS, are used.

The only reliable way of (re)configuring the device is to either
reconfigure it via the supplied USB utility (ver. 0.0.5.6), or use
a different firmware in the AP, than 0.2.2.11 . At the moment, unfortunately,
we may _NOT_ recommend anyone to use AP-UTILS to configure these devices.

The progress of determining correct firmware that does not corrupt
the contents of AP's flash memory once it is reconfigured, is underway,
however, and as soon as such a firmware will be known, the relevant
information will be posted here.