Seagate hdd (internal) unmount/disappear after awhile i plugged in.

Summary:
Before my Seagate ST1000DM003 (1TB) failed, the disk usage always goes up to 100% active with no transfer rate, this causing my pc freeze randomly. BIOS POST shows up'S.M.A.R.T. COMMAND FAILED', but i ignored it. Few days later i can't boot windows anymore. When i'm trying to access it, it will completely disappear from my pc even bios, but it's still spinning. i have to restart or wait some time then only it will appear again. Someone said that it was known issue. check this out: Known issues with Seagate Barracuda 7200.14 Desktop Drives
Unfortunately, the firmware update failed. Is there any other way that i can update my firmware? if yes, you can guide me with steps?
I also tried to recover my data with Gnu ddrescue, the process failed too.

Details:
Last two week, i'm facing lag issue on my computer, something like the applications takes some time to open up, and my pc freeze randomly. When i take a look at my task manager, my disk 0 (primary drive which with the windows installed in) goes up to 100% active when i'm trying to open up an application, then drop back to normal percentage after that.

7 days later, the BIOS POST hold for 1 min or longer before booting windows, and it also shows up'S.M.A.R.T. COMMAND FAILED', but i pressed 'F1' to resume booting, and when windows booted successfully, windows is so lag until i can't do anything. Task manager shows that the Disk 0 is always active at 100%, all the time even there is no transfer rate. Finally i can't boot windows anymore.

Then i installed a new windows in my secondary HDD in order to fix the problem with my primary HDD. Every time i'm trying to mount the HDD and recover my data in it, it will mount first but i still can't access it, it just like loading the file. After some time, it unmount and completely disappear from my pc, even i couldn't find it in device manager and BIOS, but it's still spinning.

I found that someone was saying that it was known issue with the model of hdd. check this out: Known issues with Seagate Barracuda 7200.14 Desktop Drives Unfortunately, the firmware update failed, tried for 5 times. By default, i make a bootable usb with the firmware, and boot it up. sometimes the software couldn't detect my hdd, but when it finally detected the hdd, the update still failed. Is there any other way that i can update my firmware? if yes, you can guide me with steps?

I also tried to recover my data with Gnu ddrescue, the process failed too. Thanks for reading it, sorry for my bad english. appreciate your help

P.S.
- Hdd doesn't have clicking sound, i think that's the problem with logical damage.
- I also faced this issue last time, then it resolved when i formatted it and installed new windows again. But i want the data back this time.
- Will this problem occur if i didn't defrag my hdd for a long time?

System: Windows 8.1 Pro

HDD: Seagate ST1000DM003 (1TB)