As a complete newbie, I found this most interesting and thankyou for posting it.
I bought a G300 yesterday from Vodafone; got it unlocked for a fiver and put my O2 sim card in. Works perfectly.
Didn't like the Android 2.3 (B892) interface. I much prefer ICS, which I have on my Toshiba tablet. So, I thought I've not much to lose. I downloaded the B892 from HUAWEI rom to be on the safe side (emergency restore) and then downloaded the B934 rom from the HUAWEI website. Just followed the instructions given in this topic and replaced the recommended B927 file with the B934. I did get the 'update failed' problem, but the fix given (U8815 middle package) worked perfectly. B934 installed without a problem. I've not bothered with any of the vendor stuff as I am not a Vodafone customer. Thank you so much for this. All I need to do now is find a nice dialler app to replace the standard one - it is a wee bit boring. Any suggestions?
BTW, does anyone want to buy a Vodaphone £10 top-up code for £9? The SOB's made me buy it with the phone.