M8 flashing error

Can anyone tell me what the problem is pls.

Starting flash process…
target rom version: 6.14.707.1
found large-zip header, file count: 6
processing file 1/6…
sending ‘zip’ (53966 KB)…
OKAY [ 2.891s]
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…
FAILED (remote: 42 custom id check fail)
finished. total time: 5.484s
Flash process completed.
Flash not successfull, reboot will not be done