The service manuel is very helpful, we where able to restore the device to its working operation again.
Text excerpt from page 87 (click to view)
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1. Starting the program
Click on Start, and select Program, Renesas, Flash Development Tool Kit 3.1, then Flash Development Tool Kit 3.1. The workspace will open.
A
B
When the program starts, the following message will be displayed. Click on OK.
To change the port where the RS-232C jig is to be connected, modify the setting in the following way (if the port does not need to be changed, skip to "2. Selecting the .mot file to be downloaded into the EFX-1000"): Click on the Configure Flash Project icon.
C
The Flash Properties window will be displayed.
Then the window shown below will be displayed. Select Open a recent project workspace then click on OK.
D
Click on the Communications tab. The screen shown below will be displayed. Click on Port.
