This firmware link below work Only for follow Device..
Brand : XL-103Q
Phone Model : XL-103Q
Android Ver : 4.4.2
CPU/Processor : SP7731GEA_V1.0.0 SPD
Project ver : u7s_fm-user 4.4.2 KOT49H 14B_U7S.FM.V3.05 test-keys SW Version : U7S.FM.V3.05
Download an Extract Research Download / UpgradeDownload from here Launch Research Download/UpgradeDownload Tool Click on load icon Navigate to the folder containing the firmware / ROM Select the .Pac file in the firmware folder Wait for it to load in Research Download/UpgradeDownload tool Click Play/Start button Now connect the device to PC while holding volume down key (Some new spd devices requires holding volume up key) Wait for flashing process to complete When you see Passed! Then note that the flashing or upgrading process is complete Disconnect and boot up device.
NOTE This clone devices do have many variants so do not tick preloader & uboot when flashing any of this ROMs, Except when the phone is totally dead. It highly recommend to make a full backup of the phone (from preloader to Android) before flashing any of the Firmwares so if you end up with a Dead phone. the full backup you made will restore the phone as it was before flash to avoid problems. If you get the No Space Error while trying to flash the phone, use miracle box or any other chinesse flashing box