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Pager4 firmware upgrade instructions
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- disconnect the power supply from the device and also disconnect the device from USB if connected
- open the .exe firmware updater application
- click on the "Firmware" button
- remove the SIM socket cover and open the SIM socket
- keep pressed the microswitch placed near the SIM socket and connect the device to USB
- release the microswitch
- wait for the progress bar(s) to complete (should show up at least in the first window)
- click "Cancel" for all pop-up messages asking for formatting
- when the progress bars have completed, disconnect the USB, power up the device and
  check the operation