Download Android ICS 4.0.4 Stock Firmware for Lenovo A630T smartphone from here or here. Download another Lenovo firmware from here.
Archive name: Lenovo_A630T 4.0.4 fw
Archive file size: 392 MB
Image: Lenovo_A630T_SJDS_ROM_20150419 & Lenovo_A630T_SJJL_ROM_20150419
Model: Lenovo A630T smartphone
Build number: lenovo17_td3001_ics2-user 4.0.4 IMM76D A630t_S114.130318 release-keys
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.