Download Colors X40 official stock firmware from the link here, and follow the provided flashing instructions to learn how to flash the stock rom.
If you notice that any of the links provided below is broken or doesn’t work, please post in comments section so we fix and update it ASAP.
Download Options
File Name: Colors_X40_V1_WBW5205TE_0201_T5022.zip
Size: 440 MB
Firmware – Download
File Name: Colors_X40_V2_WBW5205TE_0201_T5058.zip
Size: 493 MB
Firmware – Download
File Name: Colors_X40_V3_WBW5205TE_0201_T5086.zip
Size: 488 MB
Firmware – Download
File Name: Colors_X40_V4_WBW5205TE_0201_T5105.zip
Size: 486 MB
Firmware – Download
File Name: Colors_X40_V5_WBW5205TE_0301_T5153.zip
Size: 487 MB
Firmware – Download
File Name: Colors_X40_V6.zip
Size: 459 MB
Firmware – Download
How to flash
After downloading the firmware, follow the instructions here to flash.