Oki 5950 - Manual (Page 167)

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Feature Set Guide: English 157
! DO NOT turn off the T.38 facsimile machine while the
upgrade is in progress.
If the machine is turned off, it will malfunction when it
is turned on. The machine will also malfunction if an
error occurs at the PC during the firmware upgrade.
To correct the problem, you must upgrade the firmware
again.
8 When the firmware upgrade is complete, the Ended Data
Renewal screen appears.
9 Click OK.
10 The Program Renew screen displays.
11 Click Close.
12 The Program Renew screen closes.