title: adb: error: Read-only file system when trying to push hosts file
body: <p>I try to push updated hosts file into the android device which I create with Android Studio.</p>
  
  <p>I follow these steps:</p>
  
  <pre><code>~/Library/Android/sdk/platform-tools/adb devices
  ~/Library/Android/sdk/platform-tools/adb -s emulator-5554 remount
  ~/Library/Android/sdk/platform-tools/adb -s emulator-5554 pull /system/etc/hosts ~/Desktop/
  ~/Library/Android/sdk/platform-tools/adb -s emulator-5554 push ~/Desktop/hosts /system/etc/hosts
  </code></pre>
  
  <p>After the last command, I get this error:
  "adb: error: failed to copy '~/Desktop/hosts' to '/system/etc/hosts': Read-only file system"</p>
  
  <p>About 2 months ago, I tried the same steps and I didn't get any errors. It worked correctly. </p>
  
  <p>What more should I do?</p>