Security problem with Huawei dongle

Recently installed a new Huawei dongle for broadband E173 used in Singapore. After installation, it disabled the existing firewall. Then it performs a LiveUpdate after being connected. Noticed data being sent out. Also noticed a file OUC.exe being installed and details of sites visited being logged.
Also, there is intermittent drop line. Prior to this broadband installation, firewall detected numerous access attempts from some China telecom company eg Zhejiang Telecom, etc. After this, none detected.
Also found OUC log of old sites visited.
Question:
1. Why firewall security is reduced/disabled?
2. What is LiveUpdate for?
3. What is OUC.exe for? (oh, you see?)
