[Avila] unmount GW2348 after make menuconfig

[hong zhang]

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Dear folks,
   
  After make menuconfig, and new zImage and ramdisk.gz in /tftpboot
  are loaded to the GW2348 board. mounting to my PC does not work.
   
  I have added some custom codes into snapgear and want to reload new snapgear. How do I keep my changes already in old snapgear?
   
  Thanks.
   
  ---henry
   

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