Just reset the Bridge back to factory setting to remove any previous owner settings… see this link:
https://support.sonos.com/en-us/article/reset-your-sonos-product
I would personally choose to add the Bridge away from the router to begin with, using the ‘Settings/System/Add Product’ option in the S1 App (whilst your Play:5 (Gen1) is visible in the App) and then simply wire it to the router when you have completed its setup. Keep it away from your router - I suggest at least one metre away, or more.
Once the Bridge is setup, then remove any WiFi credentials (if stored) in the App ‘Settings/System/Network/Manage Networks’ area and ensure the SonosNet channel is at least 5 channels away from your routers 2.4Ghz WiFi channel.
My existing bridge stop working
Actually it was probably just the power supply that stopped working. Bridge wallwarts have a habit of doing so as they age. You can easily get compatible replacements off Amazon.
@ddiep
It might be worth trying your old Bridge (if still available) with the power supply from your new Bridge - just to see if it is what @ratty has suggested above.
Honestly, I’d avoid adding a BRIDGE altogether at this point. I’d either go with a BOOST (which can still run S1 if needed), or plug directly into a Sonos speaker, which then takes over those functions.
Thanks all for the your responses. My player 5 Gen 1 and Sonos One Gen is all working now. Much appreciated the responses!! :)