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CC2640 OFFchip OAD ,用BLE DEvice Monitor升级失败,打印如图所示消息是什么原因呢

Other Parts Discussed in Thread: CC2640R2F, CC2640

协议栈版本ble_sdk_2_02_01_18,片外flash W25Q64,使用Device Monitor(2.8.0) + cc2640r2f launchPad (host test工程)对2640进行OAD,打印如图所示消息,进度调不动