Garmin beschreibt das wie folgt:Beginn Kopie:If after updating your Nuvi, the welcome screen has Sytem Software Missing,
please follow these instructions through in order to return the Nuvi to its
original state.
1. Turn off the Nuvi and disconnect it from your
computer.
2. Attached to this email are the files that you will need in
order to re-install the software on your nuvi. Drag and drop the attachment
on this email to your desktop.
This attachment is in the form of a zip file. Extract the files this
contains to the desktop of your computer. To extract these files, right
click on the file attached to this email, and select extract from the menu.
Alternatively, if you have WinZip Installed, right click on the file and
then move the mouse over the WinZip option on the menu. This will reveal a
submenu, from which you can select "Extract to here".
Included in this compressed folder are 3 files, which will be as follows
3.. Run the program USBDrivers.exe. This will ensure that you have the
most up-to-date Garmin USB drivers installed on your computer.
When the window below comes into view, select setup.
This will launch Installshield, which will guide you through the process of
installing the USB drivers.
4.. Ensure that the USB cable is to hand and ready to plug into the nuvi.
5.. Hold down the power button on the nuvi and keep it held down. The
screen will come on and then start to show Pre-Boot Mode across the bottom
of the screen.
6.. While keeping the power button held down, plug the cable USB cable
into the side of the Nuvi. Then, on the computer, drag the file
replacement_software.rgn onto the program Updater.exe.
This will launch the program that will reinstall the software on you nuvi.
The window below should appear.
As I have done here, select USB Device, and then click OK. You should still
be holding the power button on your nuvi down.
7.. Progress bars should appear on the Computer showing the installation
progress. On the nuvi, the words Loader should appear on the screen. When
this appears you can let go the power button.
8.. Allow the loader to run, and then when the message "The update was
successful appears" unplug the USB cable from the Nuvi
9.. The nuvi should now load up as normal. You may now want to run the
Updater again in order to ensure that the latest software is installed on
you nuvi. Alternatively go to the following links and manually download the
update.
Ende Kopie.
Die in der Anleitung zitierten Files sind die Garmin Usb-Treiber, die eigentlich auf dem PC schon da sein sollten, die Firmware, die Du von perry besorgen must und die Updater.exe. Die Updater.exe ist in einem Thread zum 276/278 verlinkt. Must Du selbst im Board suchen. Da die ganze Zeit die Powertaste gehalten werden muss, ist es keine schlechte Idee, eine Hilfsperson zu engagieren, die dann die anderen Aktionen am PC ausführt.