New Ussd Codes Doesn't Work On Miui V6/v7 For Mi2

Jan 8, 2013
I'm using my Xiaomi Mi2 Since 12/2012.

At first (Miui v4 and Miui v5) can work USSD codes but doesn't work on v6 and v7.

Screenshots Xiaomi vs Jiayu:

Its very annoying problem.

Any solutions exclude changing phone or downgrade version ?

I'm sorry for my English