TH-49LF8U, TH-49LF8W (serv.man2) - Panasonic TV Service Manual (repair manual). Page 47

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ADJ-5
SECTION 3 ADJUSTMENTS
<49LF8>
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
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