I just got a email from GRE saying there's a beta firmware update out now to enable P25 Phase 2 on the PSR800.
GRE PSR-800 P25 Phase 2 Public Beta Upgrade - Powered By Kayako SupportSuite
CPU Beta Firmware version U1.7 Release Notes
This experimental beta CPU software adds APCO Project 25 Phase 2 functionality to
the PSR-800 and must only be used in conjunction with the companion beta DSP
version U1.2 included in this upgrade.
When this version is installed, the uP Appl Ver line on the version screen (accessed
by pressing menu when the welcome message is displayed after a power up) will
show as version 1.7.
Project 25 Phase II, 4 slot TDMA voice is not supported.
Radio IDs, on Phase 2 voice channels, will not be displayed unless they came from
the CC before tuning to the voice channel. Radio IDs are not decoded from the voice
Priority talkgroups are not supported when tuned to Phase 2 voice channels.
Don't use "custom tables" for Phase 2 systems unless you really know what you're
doing (let the scanner handle tables)
When a Phase 2 talkgroup is active, the scanner will display D2 instead of DG.
DSP Beta Firmware version U1.2 Release Notes
This experimental beta DSP software adds APCO Project 25 Phase 2 functionality to
the PSR-800 and must only be used in conjunction with the companion beta CPU
version U1.7 included in this upgrade.
EZ Scan DG PC Application Beta version 1.07 Release Notes
Added options to the custom trunking tables to support Phase 2 operation. Unless
you really know what you are doing, we recommend using the automatic option.