Sync3.4 possible to downgrade ?

Ford SYNC 3 Support CyanLabs Update Support
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1

Hello,
Are you familiar with programme version 306?
I want to completely reset my Sync and saw that one user has a SUB stick. When you plug it in, the system is formatted and reinstalled. It takes about an hour, and then you have completely clean new software on your Sync.
Does anyone know about this?
How can I get hold of it?

SYNC Region: EU

Navigation Variant: Nav

Manufacturer Year: Pre MY20

Install Type: Retrofit

Old SYNC Version: 3.423188

New SYNC Version: 3.423188

Do you have a error message, if so what is it?
I have no real time on the screen

Update Method: CyanLabs Syn3 Updater

Syn3 Updater Version: 21330

Syn3 Updater Documentation Read: no

Syn3 Updater Log File

I have no file
2

It may be a surprise to you but everyone in here knows about this, you can download it yourself elsewhere in here. I wont give you a direct link because we don’t spoon-feed people in here.

3

Syn3 Updater.