Delete preinstalled games on used Nintendo DSi?

I believe you need to connect to the DSi Shop in order to gain access to Data Management. If you can't do that, you could use HiyaCFW and remove them from your SDNAND (which wouldn't remove them from your real NAND, but you wouldn't see them as long as you use SDNAND)

 

Can you show us a picture of your settings screen?

 

I suffer from the same problem. I can connect to internet but when i try to enter Dsi Shop it tells me to update my system (i have v1.4.1) but when i try to update its giving me "error code 034609". I have Unlaunch 2.0 installed. Since i cant update and i dont have system memory in settings, what will happen if i format system memory ? Do i need to install Unlaunch again?

 

This is the route I would prefer. The defunct shop might not even allow redownloading preinstalled titles (they are somewhat different compared to purchased titles). Deleting might be a one way road.

Unlaunch survived a "Format System Memory" on my test DSi (as expected – for the same reason why the normal "Launcher" survives the format).

Once updated there is no easy way back and DSi firmware upgrades offer virtually nothing besides blocking flashcarts (not really an issue with unlaunch).

Sorry, I don't know what that error code means (and couldn't find anything with a quick search)

Good luck anyway!

 

So formatting system memory deletes pre-installed games and not touching Unlaunch. Perfect

 

I don't think the format will delete preinstalled titles. According to the manual (DSi came with a real book!) it removes all added software.
Preinstalled titles are different: They may not be transferred to a 2|3DS and as already mentioned: It might be impossible to redownload them from the shop (I'm not sure about this).