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Bricked Garmin Astro 320

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Hello all
Following a downgrade firmware from 4.4 -> 3.4, I inadvertently managed to downgrade using a Alpha firmware 4.3 from perry site. After that, the screen is upside down with about a quarter of the rightmost part of the screen containing gibberish.
The unit works, and I can up/downgrade firmware, but only the official 4.4 from internet will partly fix the screen issue - it will still be wrong during updates.
Is there any way to restore what I assume to be in memory that I cannot reach using usb and file explorer ?
Unit: Astro 320, European version
What I have tried: up/downgrade with perry-files, and using webupdate for latest firmware, replace files with backed up content.
I have a backup of all files before I did anything.
Is there anybody out there who can help ?

Morten

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