I have a Huawei Ascend Y300 running on Jelly Bean and I can't get any diagnostic code to work on the dialer... The only thing that works is the code for displaying the IMEI:
Every time I enter a diagnostic code like
*#*#4636#*#* or anything else, it merely continues to display the dialer. :-/
I've tried looking for the stock Jelly Bean dialer but I haven't had any luck. How do I fix this?