Hi,

It looks like a mismatch between TFLM and the CMSIS package being pulled in by RT-Thread. The missing arm_helium_utils.h typically means the build is trying to use Helium (MVE) kernels, but the CMSIS package doesn’t include them.

You could try checking whether your board/toolchain actually enables MVE (Helium) flags (e.g. -march=armv8.1-m.main+mve.fp slope). If not, those files shouldn’t be compiled.
Hope that helps narrow it down