This is described on page 49 of the PRO-163/164 owner's manual
That page is titled "Initializing the Scanner"
You can download the manual in pdf format at this link
http://www.scancat.com/OnLineHelp/OEM_Radio_Owners_Manuals/PRO-163-164-OWNERS%20MANUAL_2000164_PM_EN.pdf
Initializing the Scanner If the scanner’s display locks up or does not work properly after you connect a power source or install batteries, you might need to initialize it.
Caution: This procedure clears the scanner’s memory. Initialize the scanner only after trying all other methods to correct issues.
To initialize the scanner:
1. Turn off the scanner, then turn it on again. “Multi-system Trunking Scanner” appears.
2. While “Multi-system Trunking Scanner” appears, press 0.
3. Press 1.
4. Press ENT. “Initializing please stand by” appears for about 5 seconds.
When the initialization is complete, M000 appears on the second line of the display. Bank 0 Ch 00 appears.
Do not turn off the scanner until the initialization is complete. Service and Repair If your scanner is not performing as it should,
Best regards
Jim Springer
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Computer Aided Technologies
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