TH-43SF2U, TH-43SF2E, TH-43SF2W (serv.man2) - Panasonic TV Service Manual (repair manual). Page 48

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ADJ-5
SECTION 3 ADJUSTMENTS
<43SF2U/W/E>
1.2.3. Confirmation of version
1. Display the CAT mode (Refer to Section 1 - 3.1.)
2.  The CAT mode menu appears on the screen. Select the [CD Mode] menu with [pq] buttons and press the [MUTE] button 
for more than 3 seconds to enter the CD mode.
Sub CPU firmware version
1.1.4. Confirmation of version (User mode)
1. Press [SETUP] button on remote controller.
2.  The Setup menu appears on the screen. Select the [Language] menu with [pq] buttons and press the [Enter] button.
3.  The Options menu appears on the screen. Select the [Display software information] menu with [pq] buttons and press the 
[MUTE] button for more than 3 seconds to enter the CD mode.
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