@Joseph-TP Hi Joseph. No, the firmware version 4 of the TD-W8961N V4 modem model is the latest update for 2021-04-02, version 210205. Now when I checked my modem, I found that the active firmware update of my modem is 210914. I will send you a screenshot of the additional information. I must say that I was unable to update the modem with the version posted on the site. I emphasize again that this error occurred after the last update that came for v5. I contacted the support of the internet service provider and they said that everyone who has my modem specifications has this problem and this is a disaster. 

link 1 Update site 

Unfortunately, I was unable to upload the image. If needed, please provide an email address so I can send it.

  @Joseph-TP  Today I turned off the modem for 20 seconds and turned it on. I went into the modem router settings. I noticed that all the settings I had made for the modem had changed. This happens after turning off the modem, which I explained to you in previous messages. In the Interface
Setup> internet <ATM VC ,Encapsulation,PPPoE/PPPoA section, all these settings were either changed or deleted.

And the only way I have found to solve the problem after every modem shutdown or power outage is to do Quick
Start and reset the settings. I can't even restore the Interface
Setup settings because the modem keeps flashing after shutdown and accessing the router settings with the browser is interrupted even though I'm using a LAN cable, and I can only fix it with the modem's reset button.