Hello Magd,
For the second question, BME688 AI Studio uses BME688 Evaluation Kit Board (8 sensor Board) for training. Hence, the config string of BSEC2 is provided and this can be loaded for any single sensor by using BSEC2.
Do you have further feedback?
For your first question, the support on other boards other than x8 Board is not available now.
there is still no support for other boards except the x8 one?