MyCloud fixed red light - recovery file

hi,

yesterday, after I moved a file between 2 folders, my My Cloud stopped to work.
the NAS got a red light and it is impossibile to restart.

currently, as suggested by the support, I removed the HDD WD red, I connected it via SATA cable to my Mac and I am trying extFs for Mac to recover the file but it is not able to access the HDD.

Suggestions?

Using testdisk I receive a message of Permission denied

If i go with Sudo I received an error 0:

@alexdpu

  1. Front LED
    The front LED on My Cloud Home devices is a single color, white. It is either on, off
    or blinks with a certain rhythm to indicate a specific “System Condition”. A “System
    Condition” list is outlined below in Table 1.2.

See the User Manual for a My Cloud Home