[urgent] Cannot read product revision on MPU6050 eval board

Hello,

I use MPU6050EVB with i2c connection to separate AVR32UC3 controller.

When I call the function umplStartMPU(), the product revision "prod_rev" in the function inv_get_silicon_rev_mpu6050() cannot be read correctly. It reads always 0. This gives us an error "INV_ERROR_INVALID_MODULE". So I tried to give a value directly to "prod_rev"(from 1 to 15 and 27). And I got another problem, in the function inv_mpu_set_firmware(), I cannot successfully write and read the memory, it means that the elements of "data" are different from those of "read", which gives us an error "INV_ERROR_SERIAL_WRITE".
Any idea?

thanks