Hi @zubizeratta,
I imagine you need a standalone tool to flash the device, instead of using S32 Design Studio.
You may need a standalone programmer, NXP currently does not provide any software apart from the IDEs, you can take a look into either PE Micro or J-Link for programmers and flashing tools:
Just to showcase the J-Flash tool, you can see the supported derivatives as well as the manual programming features:
Julin_AragnM_0-1719509201326.png
Julin_AragnM_1-1719509204652.png
Best regards,
Julián