help... c905

i bought an orange c905... u know it contains all that crap orange stuff and also the flash menu dont work on it...
i have been searchin on debranding alot and there are many uncertainties in my mind cuz im new to this... stuff like CDA and all that doesnt sounds familiar... can anyone help me or give me a a-z complete link how to perform debranding on c905...what firmware to use ...cuz im really confused at the moment!! waiting for reply ..!!