Download Android Jelly Bean 4.2.2 stock firmware for ZTE Grand X V987 smartphone from here or from here.
Archive name: ZTE V987 fw
Image: signed_2736_v987_miui.zip
Archive file size: 255 MB
Firmware version: Android Jelly Bean 4.2.2
Platform: Mediatek MT6589
Build number: 2013023-user 4.2.2 HM2013023 JHBCNBD15.0 release-keys