helpp me with my htc amaze 4g plzzzz

hi i have a htc amaze 4g tmobile phone,i installed a cynogenmod kitkat and the gassp ,after that the screen stuck on the bootscreen ,wen i go in recover(4ext)to restore my back up it says error cant unmount sd card ...hlp plzz!!i just got it tuesday ....

HELPP

I wanna falsh android 5.1.1 stable custom rom on lenovo a6000 plus.............now my device is on lollipop s052..............................i have tried to flash rom.zip..{mk511_unofficial_kraft_a6000.zip}.....bu t it says e:error "zip file is corrupt".....anybody plzzz help...