All of the S17 pro firmware versions are asicboost.
All the stock versions are pretty the same, the latest one has tighter security which can go against your desire when you want to change the firmware so it's not recommended.
In the miner status page, pay attention to the date.
If it's working no need to flash.
It's very unlikely that your router is causing this issue, it could be some IP conflict going on, it would be best to set a static IP for the miner which is outside of the router DHCP range, if you don't know how to do that just watch a few videos on youtubeظ