Nothing like failure and problems to learn the ropes… and so it proved with this board. It’s helped me partly understand what goes on with mbed os 6.2.
So using Mbed Studio and Mbed OS 6.2.1, I found that the GPIO’s work, Interrupts work, I2C works, SPI works, UART works (although virtual serial does not), the BMI160 IMU sensor works (well sort of - just need to test with the Interrupt), the SD card did sort of work (need to test again as one SD crapped out so problems could’ve been card related). That just leaves the elephant in the room, the PAN1326 dual Bluetooth module, which only works on Mbed OS 5.ancient. I suspect the reason that it no longer works with OS 6.2 is because maxim do not believe in partnership and in supporting the changes required.
So, as you mentioned here and on your other post, 99% of issues could be attributable to the lack of official support by Maxim. A rather poor show, by Maxim, in my opinion.