I use Keil uVision 4.74.0.22 to compile nRF51-ble-bcast-mesh-master with nrf51_sdk_v6_1_0_b2ec2e6 and get the rbc_mesh_BLE_Gateway.hex. However, I drag and drop the hex file to MBED drive and it's not working. I heard that uVision trial version only support 32KB firmware size. Would that be the problem?