====== Restoring the CWA Series' OS ======

WARNING:  Please do not attempt to restore the operating system or boot loaders unless the device is not booting properly.  If a mistake is made in the restore process, it may be difficult to get the device to boot again, and it may require returning the device for service.

===== Restoring Only the OS =====

  - Execute Utility\sam-ba_2.12.exe to install the SAM-BA utility on a host PC
  - Execute Utility\sam-ba_2.12_patch5.exe to update the SAM-BA utility with the latest features and fixes.
  - Set all DIP switches on the right-side of the CUWIN CWA to the OFF position.
  - Connect the host PC to the CUWIN CWA's USB DEVICE port.
  - Turn on the CUWIN CWA.  In Windows Device Manager, under the "Ports (COM & LPT)" node, you will see a new serial port appear.  Note the COM# assigned to that port.
  - Set DIP switch 1 to the ON position.  If you don't do this, you may receive an error in step 13 (Enabling the NandFlash).
  - Execute the SAM-BA utility installed in steps 1 and 2.
  - In the "Select the connection" drop-down list, select the "\USBserial\COM#" assigned in Step 5.
  - In the "Select your board" drop-down list, select the "at91sam9g45-ekes" option.
  - Be sure the "Customize lowlevel" checkbox is not checked.  Ignore all other options.
  - Press the "Connect" button, and a new window will appear.
  - Select the "NandFlash" tab.
  - Under the "Scripts" heading, choose "Enable NandFlash" from the drop down list, and press the "Execute" button.
  - In the "Send File Name:" text box, select the "NK.nb0" file.
  - Change the "Address" to "0x200000".  If you mistakenly omit this step, or write to the wrong address, you may need to restore the first and second stage boot loaders.
  - Press the "Send File" button.  The SAM-BA utility will upload the data to the CUWIN CWA's NAND Flash memory.  Wait for it to finish.  It should only take a few minutes.
  - Turn the CUWIN CWA off and back on again.  Wait for it to boot and recalibrate the touch screen.


===== Restoring the Boot Loader: =====

  - Follow steps 1~13 in the instructions above.
  - Under the "Scripts" heading, choose "Send Boot File" and press the "Execute" button.
  - Select to the "FIRSTBOOT.nbo" file in the file dialog window that appears.  If your device was manufactured prior to 2018, you may need to choose the "FIRSTBOOT_InternalRTC.nb0" file instead.  There is no permanent problem if you choose the wrong file; it simply won't boot.  If you're not sure, try both until you find the one that works.
  - Select "Restoring the First Stage Boot Loader" at Script.
  - Press the "Open" button, and the file will be sent to the device.  It will only take a few seconds to complete.
  - In the "Send File Name:" text box, select the "EBOOT.nb0" file.
  - Change the "Address" to "0x80000"
  - Press the "Send File" button.  The SAM-BA utility will upload the data to the CUWIN CWA's NAND Flash memory.  Wait for it to finish.  It should only take a few seconds.
  - Turn the CUWIN CWA off and back on again, and the CWA should reboot.