i tried to do sysupdate from 23.05.5 to 24.10 but it started disconnecting everytime and was not even connecting to internet . please check for errrors . then i rolled myself back to 23.05.5
I have that one wrt32x, Once you have it put back to 23.05.5, there was a couple times downloaded a corrupt upgrade file.
Now when upgrading, usually hit the reset, then switch back to other partition then flash again. The unit is still twitchy to work with, it was fun serial flash. Never going back to OEM(File under G before that happens). Put on advanced reboot23.05.5, move to unused partition press reset, do the on,off,on,off,on,off, get back to 23.05.5, flash sysupgrade again. I had this same problem when not resetting before flash
Wait a little while, maybe source(check error like you say.