Cannot access NAS shares on macOS

[mrp777]

My Linkstation NAS has been working successfully for many years. Recently, I am unable to connect to it. The device shows up on my network and is assigned an IP address. However, I cannot connect to the drive. It does not show up in NAS Navigator 2 either. I've tried connecting using cifs://nameofshare, smb://NameOfShare; smb://IP address, but nothing works.

macOS Sierra 10.12.5
Model LS-V1.0TL

[Eastmarch]

What do the lights on the front look like? I'm assuming it likely is flashing.

[mrp777]

The light at the top of the unit is flashing "red".

[davo]

How many times? There will be a number of flashes, pause, a number of flashes, pause, continuously repeated.

[mrp777]

3 flashes, pause, 3 flashes, repeat....

[davo]

It means that HDD has failed.

[mrp777]

Is this article relevant: http://en.faq.buffalo-global.com/app/answers/detail/a_id/14328/p/31,33
It says the drive cannot be mounted. Is there any way to remove the drive from the case and attempt to view externally to back it up?

Also, I unplugged the NAS for 1/2 hour. After reconnecting to power, the top light flashes continuously "blue".

*NEW UPDATE:
The NAS is now connected to the LAN. Opening NasNavigator shows that it is in "Emergency Mode". I downloaded the firmware update for osMac. Opened the dmg file. But when I double click the "update" app, nothing happens. As I mentioned earlier, I am running macOS Sierra 10.12.

[Texturtle]

Unfortunately older units updaters may not run on Sierra.

[mrp777]

Is there any other procedure for getting out of Emergency Mode? Is Buffalo abandoning units without any means to fix or update firmware? If I open the unit and take out the drive, is there any way to access the files?

[Eastmarch]

If the drive is failed, since it only has one drive, there isn't too much here to fix.

It is possible that you could recover data by plugging the unit into a Linux box and attempting to mount that drive. If it is failed in such a way that you can't do that, then you will have to rely on your latest backup. If you didn't have a backup, then it depends on how valuable that data is to you if you want to pursue professional data recovery.