Panasonic KX-FLB852CX Service Manual page 87

6.2.4. Memory Clear Specification
1
* Execute Service Mode #550 when you want to reset the all setting data keeping the user information.
2
* Execute Service Mode #710 to clear the user information in case that Main Unit is recycled.
Note:
Please restart a power supply after clearing a memory.
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KX-FLB852CX / KX-FLB852CXS