I have new (20.32) (https://we.tl/ETdbC02E2Q) but I was unable to upgrade it via webbrowser or via SmallToolSoftware (upgrade is successful, but after restart nothing changed - still old version). You can try. Let me know.

Today, after one hour TeamViewer session, they can upgrade this firmware via TFTP session. Lets see if this solve red flag network error.