Has anybody solved the boot loop problem? Orbi RBS750 and others

There are many posts across the Internet about the Orbi devices getting into a boot loop, where it stays on for just about a minute and reboots. None of the typical methods work - 30-30-30, 1minute reset+, tftp, nmrpflash, etc. The device doesn't stay on long enough to boot up services like the web console or DHCP.

You can break the boot loop by holding down sync & reset as you power on the device, it goes to a yellow-state, and someone has showed that puts it into a tftp firmware receive mode, but the device isn't actually reachable.

I cannot find anyone who has solved this particular problem, only people that gave up and said the hardware must be bad.

Years later, has anyone found an actual fix for this, or is the best response that it's hardware failure? It's rare that electronic steady state items actually fail, so I have to believe that there is some way to actually resolve it.