Consider this as an option, especially if you reset your router and entered the same wireless network name (and password), but, before that, you were able to connect to that Wi-Fi network. You need to remove the Wi-Fi network from your mobile device's saved Wi-Fi passwords list, i.e. "forget" the network, and reconnect to it.
To "forget" the network, follow the steps below:
After you have "forgotten" the network, reconnect to it.
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