title: ADB Fastboot error when flasing rom 'FAILED remote unknown command'
body: <p>I'm trying to flash Google factory image file on nexus 6P but it always stops at the same point. USB debugging is enabled, MTP mode also. Bootloader is unlocked and communicating with ADB Fastboot etc, is there something I'm missing? I've downloaded the zip file and extracted into the platform tools folder. Even installed google recommended drivers. PLEASE HELP <strong>if anyone can and accepts bitcoin or any other crypto I'll send it over for the help</strong>   </p>
  
  <pre><code>(c) 2017 Microsoft Corporation. All rights reserved.
  
  C:\Users\gemma\Desktop\platform-tools_r29.0.6-windows\platform-tools&gt;fastboot reboot-bootloader
  Rebooting into bootloader                          OKAY [  0.022s]
  Finished. Total time: 0.022s
  
  C:\Users\gemma\Desktop\platform-tools_r29.0.6-windows\platform-tools&gt;fastboot flash-all.bat
  fastboot: usage: unknown command flash-all.bat
  
  C:\Users\gemma\Desktop\platform-tools_r29.0.6-windows\platform-tools&gt;flash-all.bat
  Sending 'bootloader' (3524 KB)                     OKAY [  0.116s]
  Writing 'bootloader'                               OKAY [  0.209s]
  Finished. Total time: 0.378s
  Rebooting into bootloader                          OKAY [  0.107s]
  Finished. Total time: 0.107s
  Sending 'radio' (48120 KB)                         OKAY [  1.065s]
  Writing 'radio'                                    OKAY [  2.140s]
  Finished. Total time: 3.269s
  Rebooting into bootloader                          OKAY [  0.000s]
  Finished. Total time: 0.000s
  --------------------------------------------
  Bootloader Version...: angler-01.31
  Baseband Version.....: angler-01.29
  Serial Number........: ENU7N15C1700????
  --------------------------------------------
  extracting android-info.txt (0 MB) to RAM...
  Checking 'product'                                 OKAY [  0.019s]
  Checking 'version-bootloader'                      OKAY [  0.018s]
  Checking 'version-baseband'                        OKAY [  0.017s]
  Snapshot cancel                                    FAILED (remote: 'unknown command')
  fastboot: error: Command failed
  Press any key to exit...
  
  
  </code></pre>