I know this is probably not relevant, but I saw a news article about a thing called a pwntab or something like that, and it is a nexus 7 flashed with a ROM full of hacking and network penetration tools. This ROM is open source I think, so somebody might be able to get it working on the G300
Here are some links that I found for it:
A WARNING TO ALL G300 OWNERS! Please Read! (The Flash Memory Problem!)
Tutorial: How To (Officially) Unlock Your Bootloader!
Please, Do not use the HuaweiG300.com Tutorial on how to unlock your bootloader, it is better to unlock it officially with my tutorial!
Huawei Ascend G300 (U8815)
(Ignore this link above (if there is one). It's a skimwords (advertising) link and nothing to do with me!)
The ROMS I have used:
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