Recently I had written about Airtel Uganda E3131 3G 4G Modem. Unlocking of Huawei E398 O2 Ireland 4G dongle is also possible by the same procedure. You can refer about unlocking of Huawei E3131 locked to Hutchison Austria modem and  H3G Tre Italy E3131 (E3131S-2) dongle. Huawei E398 O2 Ireland 4G data card also comes with un-customized firmware and there is no flashing of device is necessary.
Huawei E398 4G modem dongle
Huawei E398 4G modem dongle

How to unlock Huawei E398 O2 Ireland 4G Modem?

1. Download Huawei E398 O2 Ireland 4G modem unlocker software from the link which is provided at the end of the article.

2. Now disconnect the internet and change the default sim with another network provider sim.

3. Now connect the modem to PC or laptop.

4. Let it launch the software of the modem.

5. Now close the software of modem (Huawei Mobile Partner software of O2 brand).

6. Now run the downloaded unlocker tool.

7. Detect your E398 O2 dongle into the downloaded software.

8. Now put 8 digit unlock code in “Unlock Code(6-8 digits):” box and click on OK button.

9. Now your modem is unlocked forever.

Note : Don’t use any free / wrong codes into Huawei E398 O2 Ireland 4G modem, otherwise it will be locked permanently. Pay 2.38 USD through PayPal button of this website and mention model with IMEI in the transaction.

Download Huawei E398 O2 Ireland 4G Modem unlocking tool