First I downloaded z4 root on my phone. The next thing I did was install Titanium Backup from the market. After all this was downloaded the phone was rooted and i was able to delete preloaded apps such as sprint tutorials and other stuff i didn't want. Then I downloaded ROM manager which is where I downloaded CyanogenMod and chose 7.1. I chose the first option on the list since i didn't see the sanyo zio and it worked. The last thing i did was attempt to backup the current ROM and that's where it took me to the black screen where it said fastboot. Idk what i did, but when i tried turning it on for the last time, my phone was back to normal. Usually the connection status says 3G, but now it says that i am roaming.
Does that help?