Previous versions of XDArit had a potentially serious bug. Upgrade to the version offered below (v1.02) as soon as possible...
The XDA has the ability to read and write ROM images to SD card. Using the XDA Rom Image Tool (XDArit.exe), you can use a Windows PC to read SD-cards created by the phone, and write to them as well. The program will also read the .nbf files distributed with the firmware upgrade software.
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The XDA ROM Image Tool helps you create SD-card images that will cause your phone to overwrite its ROM. This is potentially dangerous, and could kill your phone. Make sure your phone battery is fully charged before flashing the ROM. Because the tool also writes to the first sectors of a disk directly, The XDA ROM Image Tool also offers an excellent way of screwing up the data on your harddisk if you select it instead of your SD-card. We absolutely, completely, categorically and utterly reject any responsability in case you screw up your phone or your disk. All software provided here comes with sourcecode but without support. You're on your own...
Presently the XDA ROM Image Tool only runs on Windows NT, 2000 and XP. This is because the tool needs to write to disk directly, and implementing raw disk access for 95/98/ME was not a priority for us. If you feel like incorporating it, please do.
First, put the device in Wallaby Bootloader mode by keeping the power button pressed while performing soft reset. You will now see a screen that says "Wallaby Bootloader", together with a version number.
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!Dealing with 5.17 bootloaders
You can skip this chapter if you have a 5.14 or 5.15 bootloader. Version 5.17 of the Wallaby bootloader will only dump to and flash from SD card if a special key is written to the card. This key depends on the hardware ID of the SD card, and would need to be calculated before creating the card.
We have reverse-engineered most of how this key algorithm works, but ended up not using the knowledge because reading the SD serial number on Windows turned out to be fairly involved. It turned out there is an easier trick.