First : don't ever let anybody tell you you have to format your internal or external storage again, this is nonsense, sorry.
Now, you write about cwm 5.x while siyah 5i has 6.x if I'm not completely wrong..
Do this :
- Flash Siyah 5 or 4 again
- Do a Factory Reset, wipe cache and -advanced -dalvik cache
- Flash cMIUI again
Reboot, enjoy MIUI!
You might also look for Chameleon Rom, a very good stock Rom with some AOKP/AOSP goodies. Based on 4.0.4..
I hope that helped a bit!
Sent from my GT-I9100 using xda app-developers app
"...the more I see, the less I believe..."