Might not help but try hooking an Ethernet cable to the Sub and your main router.

https://support.sonos.com/en-us/article/sonos-led-lights

Flashing orange and white

The status light will flash orange and white when your Sonos product is updating.

If you’re resetting your Sonos product, the status light will flash orange and white while the reset is in process.

In rare cases, a flashing orange and white status light indicates a fault condition. If the product is an Amp or Connect:Amp, see our article on no sound from Amp with a flashing orange and white light for troubleshooting steps. Otherwise, contact Sonos Support.

Hello.  Thanks for your response.  What I did was connect an ethernet cable to the sub, and then I did the factory reset.  after a couple of minutes, the status light started blinking between white and green.  I removed the ethernet cable and then did the factory reset again and the blinking green and white appeared and I was able to complete the set up for the sub.  We have two subs in our house and I did the set up for both.  I also might mention that when the option came up to which room the sub will be placed in, the software update started and completed a few minutes later.  My issue is fixed!  Thanks!