This message was posted on behalf of Intel Corporation
There is a thread with a similar topic: https://communities.intel.com/thread/59741
A verified U-Boot could work as an alternative, but there would still be ways to access the main image due that Edison software and image are designed as open software and there is nothing available to protect intellectual property as it would contradict the open source principle. (https://communities.intel.com/message/338549#338549)
There would be ways to access the partitions and image by using dfu-utils, the Edison was designed in this way and there isn’t supported alternatives to change this.