I can confirm BIOS V1.7a resolves the issue as well. We were able to get all the remote sites upgraded to this version and boot without issues.
Here is the BIOS download link for V1.17a
https://www.supermicro.com/support/resources/getfile.php?SoftwareItemID=16660
File Name: A2SDICH2.A13.zip
Revision: 1.7a
Size(KB): 5,785
This zip file contains BIOS ROM, Flash utility, and Readme instructions. You may download the free WINZIP utility to extract the contents of this file.
MD5: 3489a359aaf37c67400ea006ebdf3f1c
SHA1: 992ca1dfe79e7a68a96fb96504fc4fd40fc1c272
Here is the BIOS download link for V1.17a
https://www.supermicro.com/support/resources/getfile.php?SoftwareItemID=16660
File Name: A2SDICH2.A13.zip
Revision: 1.7a
Size(KB): 5,785
This zip file contains BIOS ROM, Flash utility, and Readme instructions. You may download the free WINZIP utility to extract the contents of this file.
MD5: 3489a359aaf37c67400ea006ebdf3f1c
SHA1: 992ca1dfe79e7a68a96fb96504fc4fd40fc1c272