Directions which I have given you in [Only registered and activated users can see links. ] are valid.
(I will move the important parts here later)
More menu images are required, in English. Especially those concerning the system options.
As far as I can see this is a generic Chinese device, purpose-branded for a specific market.

So find a way to access memory through settings.
If there are any at all, then it should be possible to choose between PC mode and Mass storage mode.
If it does not exist (which is very possible if it is an original truck device), then certain files must be placed on the card that will allow the WinCE shell environment to run directly, because absolutely every WinCE device directly supports booting from the card. Some kind of shell unlocker.

The rest will be reduced to the replacement of software according to the principle that applies to e.g. iGO.
The software can also be on the card, if for example one of the minshell is used, by @Costas3850 for example. Find it in [Only registered and activated users can see links. ].

Personally, I would open the device, see which board it is and whose firmware I can flash.
But, for not so knowledgeable users, a simple solution is to put the mentioned minishell on the card.