Yes, this seems to have done the trick, the updates ran through after fixing the Java heap size of the controller. It's rather unfortunate that the controller does not show any information except in...

@Vincent-TP yes, port 8043 is open for myself (that's how I made the screenshots of the Omada controller) and also open for the devices to connect to the controller. The controller can also connect...

@Vincent-TP this (i.e., custom upload) is how I convinced the system to upgrade to 1.3.2 (it offered me 1.3.4 out of the box). I'll try 1.3.3 now.

@Vincent-TP concerning the current firmware: I've not tried updating to 1.3.3, as that specifically states that it's only updatable from 1.3.2 according to the firmware page: The error message is...

I've placed four EAP772 (V2) access points at a client of ours. Their initial firmware was/is v1.2.3, and I'm trying to upgrade them to the current v1.3.4. As a direct update isn't possible according...