Free Flash Drivers

hi guys
im using zenfone 5 which was kitkat previously then i updated to lollipop via sideload adb but now my device is bricked and when i try to sideload new firmware it shows the following command with error
E: failed to mount / cache (no such file or directory)
E:cant open / cache /recovery / logs
E:cant open / cache /recovery / logs
E:cant open / dev/block/mmcd1k0p4(permission denied)

when im using these commands after entering into normal boot mode
(before executing commands)

[IMG="normal boot mode in lollipop"]

1)fastboot flash fastboot fastboot.img
2)fastboot reboot-bootloader
im supposed to get this screen after executing above commands

[IMG="droidboot mode"]

but im not getting this screen guys.
im again back to this screen only

[IMG="normal boot mode in lollipop"]

sorry guys this post doesnt allow me to link images because im new to this site

i cross checked with my friends mobile its working flawlessly
help me out from this isssue bro
thank you