PGXL Firmware 3.1.2 update

Noted that Flex Release Notes for PGXL firmware 3.1.2 is dated Mar 19, 2019 and states following:

"The primary purpose of Firmware release 3.1.2 is to resolve the false
HIGH SWR alarms experienced by some PGXL users in the 160 Meter and 80
Meters frequency ranges.

There are significant changes in the way that the SWR alarm system
operates. Previously, there was a single SWR alarm detector in the PA,
that would see both an SWR event external to the amplifier, and
internal events such as a filter box failure. In this new version,
there are now two SWR alarm detectors, one after the filter box that
only looks at external (antenna system) SWR events, and the detector
inside the PA has been changed to alarm on high reflected power.
There have also been some more tweaks to the fans. You may hear the
filter box fan running, whenever you transmit on 20, 10 and 6 Meters,
and the PA is warm or hot.

The front panel display will now wake up, anytime displayed data
changes.

Rather than recall all amps for recalibration with the new SWR alarm
system, this firmware includes a default calibration that should work
fine with the majority of amplifiers. There may be a small number of
amplifiers that require calibration adjustment over dial-in, or some
other action.

Any new amplifiers, or amplifiers in for service, that shipped on or
after March 18, 2019 have been specifically calibrated for the new SWR
algorithms.

There have also been many other bug fixes.

Once version 3.1.2 has been installed, we recommend not backing up to
prior 2.x.x or earlier versions, without specific instructions or
directions to do so from FlexRadio Support."