P7-L10 B621. No available "only 2g" in network settings.

Hello good day. I updated my Huawei P7-L10, the B609 to B621 version. Earlier in network settings, I coverage option available only 2g. Since I upgraded my device now that option is not available. Just let me choose:
Automatic 4G / 3G / 2G
Automatic 3G / 2G
3G only
How I can recover select "2G only"
Thank you very much, I hope your help