Hi, if you are still interested in using the latest TensorFlow Lite for Microcontroller library, I wrote a guide and prepared a Colab notebook to generate the library compatible for almost all Arduino compatible platforms.
Everything is in the GitHub repository of the TinyML Cookbook, 2E (GitHub - PacktPublishing/TinyML-Cookbook_2E: TinyML Cookbook, 2E_Published by Packt)
In particular:
The guide: https://github.com/PacktPublishing/TinyML-Cookbook_2E/blob/main/Docs/build_arduino_tflitemicro_lib.md
The Colab notebook: https://github.com/PacktPublishing/TinyML-Cookbook_2E/blob/main/Docs/build_arduino_tflitemicro_lib.ipynb
A recent Arduino TensorFlow Lite for Microcontroller library: https://github.com/PacktPublishing/TinyML-Cookbook_2E/blob/main/ArduinoLibs/Arduino_TensorFlowLite.zip
Let me know if it works (or it does not) for you.
Best,
Gian Marco