RV50 update issues

I’m trying to update my RV50 units to the 4.9 firmware and the process seems to time out in the “Applying” stage. I’ve tried using Chrome and Internet Explorer, so I don’t believe it’s a browser issue. Does anyone have any ideas on how to remedy this? FYI, we are using the Verizon Private Network, so from what I’ve read, ALMS is not an option for us.
Thanks in advance!