can’t flash m8 sprint

hi
how are you
im unlock and s-off and now always need Activate wireless headsets
im work flash with xtc2clip but always this massage :

Starting flash process…
sending ‘zip’… (55331 KB) OKAY
writing ‘zip’… (bootloader) rom parsing start …
(bootloader) rom parsing finish …
(bootloader) zip header checking…
(bootloader) zip info parsing…
(bootloader) checking model ID…
(bootloader) checking custom ID…
Execution time is 3136(ms)
FAIL42 custom id check fail
FAILED (remote: 42 custom id check fail)
Checking if phone will restart…
Execution time is 0(ms)
boot-mode: RUU
Flash process completed.
Flash not successfull, reboot will not be done

help me

thank you