A solution for Update B174 to B197 (tested on my phone, it's ok, B175 firmware bug)
Unlocked your Y300-0100 and Update V100R001C00B174 To V100R001C00B197 ...
Huawei Ascend Y300-0100 : http://tinyurl.com/orwoojs
Read notice for upgrading your phone.
(see my other videos for upgrade to B199 Firmware version more stable and faster after upgrade to B197)