Android 6 firmware update failed

Hello,

Today I made an attempt to update my Nexus 5 to Android 6, manually.
So I put it into USB debugging mode, connected to my PC, and run "flash-all.bat" from firmware archive.

For some reason it ended up with message FAILED, but Android 6 was installed on my phone.
I wonder, what has failed, and should I worry about it, should I do something about it?

Update log:

Quote:

Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. e:\Software\Android-SDK-Unlock\Android_v6>flash-all.bat target reported max download size of 1073741824 bytes sending 'bootloader' (3120 KB)... OKAY [ 0.313s] writing 'bootloader'... OKAY [ 0.567s] finished. total time: 0.880s rebooting into bootloader... OKAY [ 0.117s] finished. total time: 0.117s target reported max download size of 1073741824 bytes sending 'radio' (45425 KB)... OKAY [ 1.812s] writing 'radio'... OKAY [ 3.183s] finished. total time: 4.995s rebooting into bootloader... OKAY [ 0.102s] finished. total time: 0.102s target reported max download size of 1073741824 bytes archive does not contain 'boot.sig' archive does not contain 'recovery.sig' archive does not contain 'system.sig' -------------------------------------------- Bootloader Version...: HHZ12k Baseband Version.....: M8974A-2.0.50.2.27 Serial Number........: 0......................8 -------------------------------------------- checking product... OKAY [ 0.092s] checking version-bootloader... OKAY [ 0.101s] checking version-baseband... OKAY [ 0.107s] sending 'boot' (9156 KB)... OKAY [ 0.541s] writing 'boot'... OKAY [ 0.781s] sending 'recovery' (10016 KB)... OKAY [ 0.603s] writing 'recovery'... OKAY [ 0.849s] erasing 'system'... OKAY [ 2.142s] sending 'system' (1019261 KB)... OKAY [ 37.004s] writing 'system'... OKAY [ 86.957s] erasing 'userdata'... OKAY [ 38.990s] formatting 'userdata' partition... Creating filesystem with parameters: Size: 29236371456 Block size: 4096 Blocks per group: 32768 Inodes per group: 8192 Inode size: 256 Journal blocks: 32768 Label: Blocks: 7137786 Block groups: 218 Reserved block group size: 1024 Created filesystem with 11/1785856 inodes and 156120/7137786 blocks malloc: Not enough space Cannot generate image. FAILED () finished. total time: 170.121s Press any key to exit...