SL40 ?Memory Full? message

[Piper J3]

I'm working to install some AWOS frequencies in a friend’s Garmin SL40 and I get a “Memory Full” message. I looked in the manual and did a search online and can’t find solution to this problem. Any help appreciated…

 

[Mich48041]

Quote from SL40 VHF Comm Pilot's Guide:

User Stored Frequencies (MEM)
When you press the MEM button the Standby frequency is stored in User memory The SL40 stores the last eight frequencies selected by the user. After eight User frequencies are stored, you will be prompted that the stack is full (mem full). You may then remove or replace the frequency or abort the process. Duplicate frequencies are not stored.
1. Press RCL and then turn the Large, outer knob to reach the User frequencies.
2. Turn the Small, inner knob to view the User stored frequencies in numeric order.