Gen 2 has changes in the UPB protocol that are significant.

What is Gen2?

The newly revamped UPB algorithms offer a boost in signal strength, especially in noisy environments, but the real benefit of Gen2 is its ability to operate in extremely noisy environments. Even though noise has been a rare problem for UPB, those few times when noise has been present have been difficult for the original generation of UPB products. Starting with Gen2, performance in noisy situations will be much less problematic. Gen2 will still work seamlessly with any original UPB products that are installed in homes where attenuation and noise are not impeding performance.

PS-Aaron, where's my sofware?