One month ago, I bought my phone HUAWEI u8815 with Android version 2.3.6 and it was running fine.
Recently I upgraded my Android to version 4.0.3 , but unfortunately the system became too slow, and the battery becomes empty within two hours. While it ran the whole day when I had Android 2.3.6. Because of that I would like to install my old android 2.3.6, if you can kindly help me the right way to do so, please.
Remarks about my system :Huawei u8815 information
model number : HUWAWEI U8815
Android version : 4.0.3
baseband version : 2030
kernel version : 3.0.8-perf-00242-gcb0aa96 android@localhost#1
build number : U8815V100R001C00B939