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there might be a problem with your logic boardl, it seems to me that your motherboard hould be repaired or replaced. i've seen that you can reflow (resolder) the wifi chip which sometimes gets knocked loose. you can venture out and do it yourself.
if you look for repair guides online for a motherboard replacement you will find something. I work for company that does iPHone repair in NYC and we do this repair frequently.
my rio carbon had the same problem and displayed upgrader all the time if it helps what i did was i cf modded my rio carbon look on google and see if your rio chiba can be cf modded and if that works that would be pretty cool and remember if you have any tech problems or mp3 problems google it and google usually will have an answer have a good day
go to this site and post an email they have sources to obtain hard to find parts. They are in NC so if you click on the contact link list what your needing. I have used them countless times to get parts that no one else can find. http://servicemanuals.vstore.ca/