Guide was compulsory back in 2011, but now you are free to choose between a guide or independent visit.
No guide, except the one (Omar) that villagers found us when we asked were willing to go with us just with a backpack without donkeys. Omar did great. He negotiated our overnight in a clay hut and even a meat dinner (Goat) for a reasonable price.
We saw their endemic Ethiopian Wolf looks like a fox.
We hitchhiked from Rira to Robe and by shuttle back to Dinsho.
Alternative officicial trek
Dinsho – Web valley – Finch Habera waterfall – Sodota camp site (4-5 h)
Keyrensa camp site (4-5 h)
Rafu campsite (rock pillars caused by an old lava flow) (5-6 h)
Across Sanetti Plateau – Garba Guracha Lake (6h) (view of highest mountain Tullu Deemtu)
Shaya Valley – Worgona (6-7 h)
Denka River bank to Dinsho (6 h)