The last I heard CHIRP does not support the 779 only the 778. You can download the software from Anytone.

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From: "Ed VA3EDB"
To: chirp_users@intrepid.danplanet.com
Cc:
Sent: Thursday June 8 2023 4:39:58PM
Subject: [chirp_users] AT-779UV compatibility

I am trying to programme this radio for a sight impaired friend. Is there a compatible radio setting to the AT779UV in CHIRP I could use? I know a few radios have been mentioned in other threads but I can’t find them in the lists.  
Any help/guidance would be much appreciated. 

--
Ed
VA3EDB
Barrie Amateur Radio Club
RAC Member
Hamshack Hotline 11481