berobispo

I received my new Odroid HC4 today and ran into the same problem. I used the recent armbian, but I booted into petitboot (with an attached display and keyboard), and erased the flash storage from there. This worked just fine! As far as I can tell, this has no downside when compared disabling petitboot via ssh, other than having to have a display and a keyboard.
 
@Igor: Thank you for providing armbian!!!

...installed the JMS Firmware upgrade to be on the safe side and it seems I did not have the current version. See output of smartctl -a /dev/sdb1 below:
 
=== START OF INFORMATION SECTION === Vendor: JMicron Product: Generic Revision: 3101 Compliance: SPC-4 User Capacity: 4,000,787,030,016 bytes [4.00 TB] Logical block size: 512 bytes Physical block size: 4096 bytes LU is fully provisioned Logical Unit id: 0x3001234567891234 Serial number: 0123456789ABCDEF Device type: disk Local Time is: Tue Jan 29 11:45:38 2019 UTC SMART support is: Unavailable - device lacks SMART capability. Serial Number has changed, still no luck getting through to the HDD...
 
EDIT: solved it! 
 
smartctl -a /dev/sdb1 gives the result pf the JMicron bridge,
smartctl -a /dev/sdb1 -d sat gives the results of the HDD.

...installed the JMS Firmware upgrade to be on the safe side and it seems I did not have the current version. See output of smartctl -a /dev/sdb1 below:
 
=== START OF INFORMATION SECTION === Vendor: JMicron Product: Generic Revision: 3101 Compliance: SPC-4 User Capacity: 4,000,787,030,016 bytes [4.00 TB] Logical block size: 512 bytes Physical block size: 4096 bytes LU is fully provisioned Logical Unit id: 0x3001234567891234 Serial number: 0123456789ABCDEF Device type: disk Local Time is: Tue Jan 29 11:45:38 2019 UTC SMART support is: Unavailable - device lacks SMART capability. Serial Number has changed, still no luck getting through to the HDD...
 
EDIT: solved it! 
 
smartctl -a /dev/sdb1 gives the result pf the JMicron bridge,
smartctl -a /dev/sdb1 -d sat gives the results of the HDD.