Could someone please re-upload the files? Links are dead.
Edit: I've solved my issue, here's tutorial, if anyone will need it.
===== How to repair Huawei C8150 with non-working 3G internet =====
Download the stock ROM. Huawei removed all ROMs for C8150/U8150 from their site, and stock ROM for U8150 will refuse to install onto C8150, here's the only ROM for C8150 I've found across Internet:
www.4shared.com/file/la-2GIpG/C8150-Bakrie.html
www.4shared.com/zip/d8MGuLlf/C8150-Indonesia-AHA.html
i.minus.com/1327053927/BHgJlUzA2IYDIX2EA7NdOA/dbbr7pQNBKOwnL.zip
www.mediafire.com/?p0j6igxm76wmd9y
stupid forum won't allow me to post links
Put the file "UPDATE.APP" to the directory "dload" on your SD card, power off the phone, then power it up while holding Volume Up button and End Call (red) button. The phone will be updated to the stock ROM (and all your personal data will be erased).
If you don't like Indonesian user interface for any reason you may select different language by clicking the button in the lower-right corner in the startup dialog.
Next you'll need to enter APN for your cell network operator.
The phone is locked to the operator - it will delete any APN with MCC and MNC code not matching Indonesia and AHA. However the 3G works even with wrong MCC/MNC, at least for my operator.
Here's instructions for Ukrainian operator Intertelecom:
Go to Settings -> Wireless & Networks -> Mobile -> APNs. There will be two APNs, click the first one. Enter following values:
APN: #777
Proxy - clear this field.
Username: IT
Password: IT
DO NOT change MCC and MNC fields.
Authentication: PAP or CHAP
APN type: *
Press Menu -> Save. Internet should be working now.
I did not try those instructions for different ROMs, but I think they might work.