Need to use fastboot boot command with bootloader locked?

[marco sandri]

need to use "fastboot boot" command with bootloader locked

dear guys, i need to backup data (media and texts) from my Nexus 5, which is locked by a pattern screen lock that i forgot.
USB debug disabled, no root permission, stock rom.
i'm trying to use "fastboot boot" command to execute without installing CWM(.img); with CWM booted i will be able to use the adb commands to move between folders and backup the data.

BUT, the command "fastboot boot" doesn't work to me cause my bootloader is locked. here the log:
C:\Users\User\AppData\Local\Android\android-sdk\platform-tools>fastboot boot cwm.img.img
downloading 'boot.img'...
OKAY [ 0.473s]
booting...
FAILED (remote: not supported in locked device)
finished. total time: 0.578s

SO, there's a way to use this command with the bootloader locked, or (impossible) to unlock the bootloader without ereasing the data?
Thanks in advance for your answers.

 

[Phil Nickinson]

Re: need to use "fastboot boot" command with bootloader locked

Unlocking the bootloader ALWAYS wipes data. It's a security thing, so I couldn't take your tablet, unlock the bootloader and STEAL ALL YOUR DATAS.