The iPad 2 essentially hacks itself every time it turns on. This is why it is untethered—you can restart it, take it to a coffee shop, and it will remain bypassed.
(A technical whitepaper on the axiomatic nature of the A5 bootrom exploit).
: These are popular in the community for "hacking" the activation process.
If you don't have access to an Arduino, several software tools claim to offer one-click solutions.
This is the simplest method and does not require a computer, but it only allows you to use a web-based interface and must be redone if you disconnect from Wi-Fi.