Download Android 4.3 Jelly Bean stock firmware for Coolpad K1 7620L smartphone from here or from here. Download another Coolpad firmware from here.
Archive name: 第五个 4.4.043.P0.150210.7620L_W00
Image: 7620L-W00 / 4.4.043.P0.150210.7620L_W00.CPB
Archive file size: 701 MB
Support: Qualcomm Snapdragon 400 MSM8926
Model: Coolpad K1 7620L smartphone
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.