First question: According to the schematics at: https://ae-bst.resource.bosch.com/media/_tech/media/shuttleboard_flyer/BST-DHW-FL039.pdf the shuttle board seems to come with a 32.768KHz crystal. Adafruit writes in this context at https://www.adafruit.com/product/2472 that an external 32.768KHz crystal is "recommended for best performance". However a lot of breakout boards provide dropout regulator and level shifting but no crystal, like e.g.: https://www.robotshop.com/media/files/pdf/bno055-9-dof-absolute-orientation-imu-module-schematic.pdf How important is the crystal? Second question: What are the differences between the BNO055 and the BNO080
