You want to hear something else ... OK.
Buy a professional tool that support your drive, HW + SW (you'll be surprised about the price....

)
With such tool, you can communicate, or at least try to, with the drive.
Then you can try to revert the changes you have made, and pinpoint if crucial parts of the firmware recorded on platters have been overwritten by the different FW update the help judging what to do.
Or it can help to determine exactly what is the problem.
Naturally you have to full study and understand the manuals and possibly you need a certain background on Seagate FW structure.
Another simple solution is to seek pro help in your area or otherwise, if you really want, there are valuable members of this forum near you that can handle your case.
I can't pronounce as I didn't see the drive and don't know the exact history of the case - remote clairvoyance is not between my offered services.
P.S. according to what has been written /overwritten during the update process, data on your drive may be altered or the recovery will be more difficult than usual.