Looking for W52X.rfs [Recovery files]

Hello,

I have 10+ Yealink W52P units that have some sort of firmware issues causing them not to get DHCP.

I have them in recovery mode, using Wireshark I can see they are searching for the recovery files using TFTP.

I am unable to find a download for these. I have seen posts of other users asking the same question.

These units were all at firmware: 25.50.0.22

Where can I find these available for download?

I don't understand why these aren't available publicly available. I understand that there is a FTP site @ ftp.yealink.com. However I am unable to authenticate. I have tried yealinkftp as the user and password since I read this may be the default. I have also tried other combinations to no avail.