PT-LX270U, PT-LX270E, PT-LX270EA, PT-LX300U, PT-LX300E, PT-LX300EA (serv.man3) - Panasonic Projector Service Manual (repair manual). Page 52

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PT-LX270 / PT-LX300 series
5-5
5. Click "Communications".
- Select “Serial Port”, then click “Configure”.
    - Select the COM Port which you are using.
6. “Serial Port Configuration” picture will  
       appear on the screen.
- Make sure the settings are as below:
    (1) In “Baud Rate” item, select “115200”.
    (2) In “Data Bits” item, select “8”.
    (3) In “Stop Bits” item, select “1”.
    (4) In “Parity” item, select “None”.
    (5) In “RTS” item, select “Enable”.
    (6) In “CTS” item, select “Disable”.
(7) Key in “2000” into “Read” and “Write” 
          items of “ Timeouts (in milliseconds)”.
- Click "OK".
7. Choose "Flash Loader".
- Click "Browse" to search the firmware file
(*.img).
- Click "Open".
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