failed to process command flash: RECOVERY ERROR(0x140005) ?????

[ngochunglt]

My divice Dell Steak 7 - 3G
divice not ROOT, not CWM.
it's the passcode lockscreen.
i want restore but failed
i'm coppy file update.pkg to sdcard install >>>> do not working
i'm fastboot wirte file recovery.img >>>

read after wirte verify FAIL
Failed to process command flash: recovery error ( 0x140005 )


you are help me!
tks.

i'm come from vietnamese.
(I'm speak English very bad)