Bulgaria Huawei E3131S-2 Vivacom modem comes with un-customized firmware and can be unlocked via unlock code and unlocking software only. If you are an owner of E3131S-2 VIVACOM modem then you can unlock it without flashing. You have to only follow some instructions and you need Huawei new Algo unlock code of your IMEI.
1. Download the unlockig tool of E3131s-2 dongle from the end of the post.
2. Now disconnect the internet and change the default sim with another network provider sim.
3. Now connect the modem to Windows PC or laptop.
4. Let it launch the software of the dongle.
5. It should ask you unlock code / password. Just enter the 8-digit unlock code and your Bulgaria Huawei E3131S-2 Vivacom dongle is unlocked forever.
In case, Bulgaria Vivacom locked Huawei E3131 dongle does not prompt for unlock code then close the software of modem (Huawei Mobile Partner of Vivacom brand).
Now run the downloaded app and detect your dongle under it. When the app will show the 15-digit IMEI, then input the correct 8 digit unlock code in “Unlock Code(6-8 digits):” box and click on OK button. Now your modem is unlocked forever.
Note : Don’t try any free / wrong codes into your Bulgaria Huawei E3131S-2 Vivacom dongle, otherwise it will be locked permanently. Pay 1.50 USD through PayPal button and mention model and IMEI in the transaction. Correct code will be delivered via email.