Download HUAWEI_Y511_T00_SJJL_QJTM_201217 firmware from here or here. Download Huawei_Y511_T00_SJDS_20141218 firmware from here or from here. Download previous firmware from here.
Archives: HUAWEI_Y511_T00_SJJL_QJTM_201217 fw / Huawei_Y511_T00_SJDS_20141218 fw
Archive size: 206 MB / 18 MB
Build number: Y511-T00-user 4.2.2 HUAWEIY511-T00 C112B169 release-keys
Build number: Y511-T00-user 4.2.2 HUAWEIY511-T00 C112B169 release-keys
Platform: Mediatek MT6572