MyCloud app only show the EFI partition

I desperately need your help on this problem.

As you can see in the screenshot above. The My Cloud app only regonize my EFI partition thus I cannot access the main partion. Through this artice (http://support.wdc.com/KnowledgeBase/answer.aspx?ID=11766) I’ve learned that it can only access the 1st partition and i"m supposed to formart my drive to one partition only (http://support.wdc.com/KnowledgeBase/answer.aspx?ID=3865), but there’s no action can be made on the EFI partition. So what am I supposed to to to solve this problem. I deserately need to solve this because I only have the drive to backup my gopro(es) sd cards while travelling. Please help.

The WD My Cloud app will not allow you to format the unit. You will need a computer in order to change the unit’s configuration.

If you don’t have any data on your MPW. You can use the Factory+Disk restore to get the MPW back to a single partition. If you have data on your MPW then backup the data before you do a Factory+Disk restore.