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Different scenarios

Depending on boot scenarios, the tool options are different:

Scenario CoreELEC is booted from external media AND
1 not installed on eMMc
2 installed on eMMc together with Android
3 installed on eMMc by itself
OR CoreELEC is
4 booted from eMMc

1. CE not installed on eMMc

Android version 7.x.x or better has to be installed on the device prior to being able to boot CoreELEC from External or Internal Storage.

A. CoreELEC can be installed in dual boot mode

Use CoreELEC data from
  [1] current used SD or USB device
      Install CoreELEC on eMMC without removing Android from the device.
      Dual boot of Android and CoreELEC is possible.
      Not all memory of the eMMC can be used because of Android.

  [2] existing backup on current used SD or USB device
      Install CoreELEC on eMMC without removing Android from the device.
      Dual boot of Android and CoreELEC is possible.
      Not all memory of the eMMC can be used because of Android.
      An existing backup of the CoreELEC data on on current
      used SD or USB device will be used for installation.

B. CoreELEC can be installed stand-alone

          
Use CoreELEC data from
  [3] current used SD or USB device
      Install CoreELEC on eMMC and remove Android from the device.
      Only boot of CoreELEC is possible.
      The maximum of memory of the eMMC is used.

  [4] existing backup on current used SD or USB device
      Install CoreELEC on eMMC and remove Android from the device.
      Only boot of CoreELEC is possible.
      The maximum of memory of the eMMC is used.
      An existing backup of the CoreELEC data on on current          
      used SD or USB device will be used for installation.

2. Existing dual boot

CoreELEC and Android share the devices eMMc. This setup is recommended by Team CoreELEC.

A. Migrate CoreELEC dual boot to single boot installation

Use CoreELEC data from
  [1] current used SD or USB device
      Install CoreELEC on eMMC and remove Android from the device.
      Only boot of CoreELEC is possible.
      The maximum of memory of the eMMC is used.
      All existing CoreELEC data on eMMC will be removed
      and the new data from current used SD or USB device
      will be copied to eMMC.
       
  [2] the existing data on eMMC
      Install CoreELEC on eMMC and remove Android from the device.
      Only boot of CoreELEC is possible.
      The maximum of memory of the eMMC is used.
      The existing CoreELEC data on eMMC will be used for installation.

B. Renew current CoreELEC dual boot installation on eMMc

Use CoreELEC data from
  [4] current used SD or USB device
      All existing CoreELEC data on eMMC will be removed
      and the new data from current used SD or USB device
      will be copied to eMMC.

  [5] existing backup on current used SD or USB device
      All existing CoreELEC data on eMMC will be removed and
      the new data from an existing backup from current
      used SD or USB device will be copied to eMMC.

  [6] Make a backup of current CoreELEC dual boot installation 
      on eMMC to current used SD or USB device
      Make a backup of all CoreELEC data on flash and/or storage
      partition on eMMC to the current used SD or USB device

  [7] Remove current CoreELEC dual boot installation on eMMC
      All existing CoreELEC data on eMMC and the existing
      CoreELEC dual boot installation on eMMC will be removed.

3. Existing single boot

CoreELEC is installed in Single boot mode. Android is removed from eMMc to create room for Storage.

A. Renew current CoreELEC single boot installation on eMMc

Use CoreELEC data from
  [1] current used SD or USB device
      All existing CoreELEC data on eMMC will be removed
      and the new data from current used SD or USB device
      will be copied to eMMC.

  [2] existing backup on current used SD or USB device
      All existing CoreELEC data on eMMC will be removed and
      the new data from an existing backup from current
      used SD or USB device will be copied to eMMC.

  [3] Make a backup of current CoreELEC single boot installation 
      on eMMC to current used SD or USB device
      Make a backup of all CoreELEC data on flash and/or storage
      partition on eMMC to the current used SD or USB device

4. CoreELEC booted from eMMc

CoreELEC is installed to eMMc and booted.

A. Backup to external media

  [1] Make a copy of current CoreELEC installation on eMMC to current
      used SD or USB device
      Make a copy of all CoreELEC data on flash and/or storage
      partition on eMMC to the current used SD or USB device
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