For my experience :: Nuvi 7xx can add Logo.bin from 1355CHN v 2.20
Here is Link ::
[Only registered and activated users can see links. ]
You can use RGN_Tool to save logo.bin
Then make a rgn file using original boot.bin + logo.bin --> out.rgn
Flash out.rgn to your nuvi then you will get Chinese logo instead volvo logo.
-Then use GIR Editor to replace Chinese logo with original Garmin logo
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