Dear @Wobaffet
Sorry for the late response, reviewing your case, I notice that in this board the SEGGER J-Link with a 9-pin Cortex-M adapter and V7.66c or newer is required due the only interface available is the JTAG header (J204), sorry for the inconvenience.
please refer the Getting Started section 3.3.3 Flashing and debugging SLN-TLHMI-IOT Projects.
Thank you for your interest in NXP Semiconductor products.
Kind regards,
Ramon.