@BusyMind Then on each devices (when forget them and enter on main configuration) why says (US) version of firmware ?. On device sticker says US version. Everything seems messed up. So "Canadian"...

@BusyMind Tried with v5.3.2 for minimum pre-requirement, says cannot install v5.3.3 without this pre-requirement version ... same thing Tried with edge, chrome, firefox

@BusyMind I had tried also to forget the device and load the firmware directly into device as below. I do not know from where V3.0 [Custom] appears here on controler on the device itself says the...

I try to upgrade these routers to the latest firmare but says invalid files, brought from Amazon. I do not understant, give me these errors

@GiorV Try to attach a log here. I think can be downloaded. Maybe the teck team will figure out. Seems that only with multiple tries goes and the USB stick is only an coincidence here.

the USB stick is a very old one, maybe get corrupted I do not now and not interested now to check it out but for sure was a fix by removing it at before 4th try.