The two tarball packages in this FTP directory (obb-fcmods-r1.tar.bz2 from
2017-11-24 and obb-fcmods-r2.tar.bz2 from 2019-02-25) have been produced and
released at a time when we did not know just how bad OBB's radio transmissions
are, i.e., prior to our CMU200 tests performed on 2019-03-09.  Armed with the
new knowledge from those tests, we now know that both with and without our
changes (i.e., both our modified versions and the current OBB official
mainline), OBB's radio transmissions are in gross violation of GSM
specifications at least in the following known ways:

* At least in the test scenario when the CMU200 instrument acting as a BTS
  makes a call to the connected MS, OBB's implementation of GSM MS transmits at
  each band's maximum power level instead of the lower power level commanded by
  the CMU acting as the BTS.

* When the CMU200 commands the connected MS to change its Tx power level, OBB's
  implementation of GSM MS does not act on these commands.

* Even when the MS Tx power level is set to each band's maximum on the CMU200
  before initiating the call to the MS and not changed afterward, the power ramp
  put out by OBB is flagged by the CMU as being out of tolerance.

In light of these observations with a properly calibrated professional GSM MS
test instrument, we know now with certainty that OBB's radio transmissions are
in serious violation of GSM specifications, these serious violations are NOT
fixed by the changes in obb-fcmods-r1 or obb-fcmods-r2, and anyone who continues
to run OsmocomBB software on Calypso GSM MS devices with real antennas putting
out real radiated transmissions despite having read this warning will not only
be causing interference and disruption to public radio communication networks,
but doing so *knowingly and willingly*, which involves a higher level of
criminal culpability.

All support for obb-fcmods-r1.tar.bz2 and obb-fcmods-r2.tar.bz2 packages is
hereby officially withdrawn.  We cannot simply delete them, as that would be
information suppression, hence we are attaching the present notice instead.
Please do NOT run any of the binaries contained in these packages on any
Calypso GSM MS devices, unless you are taking special precautions to disconnect
the antenna and connect a CMU200 instrument instead via a cabled setup with no
radiated transmissions; doing the latter on any device other than FCDEV3B
requires special probe adapters to be inserted into the phone's RF test port,
which disconnects the internal antenna.