How to uninstall ice cream sandwich update on huawei ascend g300? I have an ascend g300 from vodafone which I have unlocked and moved to another provider.

Yesterday I updated the os to ice cream sandwich following these instructions.

Since then the phone intermittently does not recognise the SD card when it wakes up from sleep. Sometimes it "prepares the SD card" and sometimes it says blank SD card or unrecognised format. Often if I restart the phone it starts working again.

The phone has also twice spontaneously restarted itself when it was supposed to be asleep.

I tried formatting the sd card in the phone and then reset to factory defaults. The phone was reset, but it didn't reformat the sd card, all my data was still there.

I'm now thinking I'd just like to uninstall the update, but how would I do that?
There is an official Vodafone Gingrbread downgrade here.
http://www.huaweidevice.com/worldwide/downloadCenter.do?method=toDownloadFile&amp;flay=software&amp;softid=NDY4ODE=