Sorry, a compatible remote is required to set up any Roku device. Once it's set up and connected to your local network you can also control the Roku with the Roku app on a phone or tablet connected to the same net.
The 2500 uses Infrared (IR) signals from the remote, but can't be controlled by wifi. You can purchase the "Simple Remote" from Roku on this Accessories page. Or you can use any inexpensive IR universal remote you find online or at a local store as long as it says it can control Roku devices. Note Roku TVs use a different command set than Roku players so be sure you get the right one.
But the 2500 is an old unit which doesn't have the enhancements added to later models that many channel apps now require. You might be better off putting your money toward a current model that supports higher resolution, runs faster, and will run all current channels.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
