OK - I got somewhere with Optus last Sunday (I have the same issue but it happens every couple of minutes - Internet redirects to the Huawei modem login page, which is useless).
I got through to an Optus engineer on Sunday who spoke with his boss. He said that this is a known issue with the Huawei 818 modem and firmware 10.0.5.2. It is caused because the modem is going looking for a 5G connection and is dropping the 4G connection to do so. No handshake - no internet. In areas without 5G connections or where there's not a 5G plan, this screws-up the modem.
The only workaround for now is a new modem until Huawei release a new firmware. For some reason they are not allowing people to revert back to the previous versions (notably 10.0.2.2).
They organised a new modem to be delivered to me by Wednesday - which didn't occur. Turns out no one made any notes on the call. They now have no notes on their system that I was ever meant to be sent one and I'm back at step 1 again with customer support. So, currently paying for internet that I can't access, like the rest of you, but waiting for Optus to get back to me.
So, there you are. It's caused by 5G. Finally a real reason to complain about 5G. 😉
Have to agree with @Helmerson here. The Huawei B818-263 is a 4G/LTE device only. As for the firmware, I contacted Huawei and Optus and a rollback to firmware 10.0.2.2 is not possible and not available for download. Which is frustrating. Getting a replacement modem may not solve the firmware issue as they may now be updated themselves. Make sure you have the correct APN set as well. It's either 'LTEBROADBAND', which I believe it defaults to, or, as I have been told on many occasions by the Optus Chat person, CONNECTLTE. Your system profile in Optus needs to match this APN.
Surely the technician who blamed it on 5G and offered to replace the modem was taking the p*ss out of the customer.
My view is Optus don't have a solution and they will just send you around in circles until you go away.
It is a Huawei problem.
Mine was OK for a month or so, but now has started doing it again more regularly maybe once or twice a week. Sometimes twice in a day.
So far have not been able to find a download link for the old firmware. Nor do I know if it's possible to install an older firmware if I could even find the file.
Hi - I'm trying to reply to you to give more info, but for some reason there's a word in the text that the forum doesn't like and tells me to remove the highlighted text - but nothing is highlighted. Does anything at Optus work? I can pm you it and see if you can post it?
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let's try this.... letter p might be the problem ....
How I figured it was that Huawei made a group firmware with a load of if...then... lines to separate the different models. The B818 model doesn't do 5G but I figured they just got one of the if...then... wrong. But he could have been trying to just get me off the line and take the p while he's doing it. I'm always polite on these voice calls so he'd have to be a bit of an arse to do that.
I was on their "message us" line for 1.5 hours yesterday with 9 minute pauses between my message and their response each time. End message was that a case manager will reply in 24 hours. I'll keep you updated, but thank goodness I have a vodafone mobile so I can hot spot. Been doing that since last Friday.
If anyone gets a new modem change the update to manual and don't update!