stock UK rom (takes forever to download, but handy if you brick the phone)
http://consumer.huawei.com/uk/support/products/downloads/detail/index.htm?id=23023&pname=Y330-U01&pcode=Y330-U01

to unlock bootloader:
http://www.modaco.com/topic/362821-tutorial-how-to-officially-unlock-the-bootloader-with-definitions-relock-guide-included/page-17

to install CWM recovery: (it can't mount external SD because it looks for it in wrong place, but flashing etc works):
http://www.phonandroid.com/forum/y330-custom-recovery-installation-t114528.html

rooted stock rom:
http://www.phonandroid.com/forum/rom-huawei-y330-u01-root-t117554.html

rooted stock material themed: (read note below)
http://www.phonandroid.com/forum/huawei-y330-material-by-speedo-t120876.html