Replace the software in any WinCE devices boils down to a simple delete old and paste new one. And backup it first, of course.
The main problem is whether you can access the device memory at all. The easiest way is if when the complete software is on the card, then you can do anything you want.
You just have to keep the same structure of files, folders and names.
On highly customized devices (Alpine, Blaupunkt, Clarion, Zenec...), you can put only cr*cked software intended for it.
If the software is in the internal memory of the device, look for answers on the Zenec forums.
If it is possible at all.
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