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M3900 Flash Download Page 237 of 504
Telephones and Consoles Description, Installation, and Operation
Phase III Note: This is not a standard
process. M3900 Phase III phones
should not be configured on a
Release 25.08 system.
1. Follow the Small System
Release 25.08 to Release 25.10
Re-issue procedure for Phase I
and Phase II telephones (above).
The 25.10 Re-issue contains
M3900 Phase I firmware for M3902
and M3905 telephones and
Phase II firmware for M3903 and
M3904 telephones. Follow the
Flash Download process to
downgrade the M3900 Phase III
phones to Phase I/II firmware.
Table 37
Flash Download procedure matrix for Small Systems (Part 9 of 18)
Present
software
Upgrade to
software
Keycode
required
M3900
telephones
Upgrade steps