Lost password: tried changing it via SSH in the backend, but got 'refused'

After trying the following:
1, Holding the reset button for 3 seconds to reset the system
2, Three different admin passwords (including the Cloud Key)
I found the following link and tried its instructions:

https://www.qnap.com/zh-tw/how-to/faq/article/如何透過-ssh-連線-qnap-nas

When I try to log in using PuTTY, I get “Network error: Connection refused”. I understand that I may not have enabled SSH support previously, but in this situation, is there another way to resolve my login issue?

Sorry, I pasted the wrong link above. The reference should be the following:

https://www.qnap.com/zh-tw/how-to/faq/article/im-unable-to-log-in-to-qts-and-the-password-reset-does-not-work-what-can-i-do