Unbrick 3TB Gen-2 - Help needed

Hello cat0w,
Yes I reformatted the disk. Long story but I lost communication with the Mycloud and nothing I could do at the time could re-establish a connection. I tore it down and used DiskInternals Linux Reader to grab as much of the data off the drive that I could which was quite successful geting back about 80% of the data.
It’s been sat to one side for at least 6 months untill last week when I decided to try and resurrect it.
One of the programs I tried was to re-image the drive after seeing several postings claiming sucess so intially ran the format prior to loading the image.
With regard to the blue flashing light it remains flashing for as long as the power has been applied but generally I power down after 30 mins has elapsed.

The following post looks like it may have the solution.

[My Cloud Gen2] Using an 8TB HDD and Formatting Failure (Error Code: 600)]([My Cloud Gen2] Using an 8TB HDD and Formatting Failure (Error Code: 600))

Regards