Worked with One Individual who's computer was Stuck on Sequoia 15.1.1 released Nov 19, 2024
After much Q & A and Terminal Downloads of Full Version 15.4
Still not go at that point
Come to find out, they had a Third Party Security Software installed with an endpoint Kernel Extension installed
Totally Useless software that only creates problems and is total un-needed
The pointing being that having to use DFU Mode would the the Very Last cause of action to be taken if All Other Avenues have failed
PS - Have updated 1 M1, 1 M2, 1 M3 and 1 M4 from Squioa 15.0 to every single version and currently running Sequoia 15.4 on each machine without any issues
Humour here.
The only issue I have had is which machine to update first