I've downloaded the 1.11JP ROM, its an executable so how does it update the PDA?
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I was about to say: just follow the instructions on the site and then realised that you might not be able to read Japanese
so here is a summary:
Put card_update_3000111.exe onto a Windows machine (you got one of those right?) and run it to extract the files. (it's a self extracting zip file).
Then copy all the extracted files to a SD or CF card. (if your windows box has no card reader, then put the memory card into your Z and connect it via USB cable and switch it to share your card instead of your hdd so you can transfer the files directly to the card) Make sure you put the files into the card's root directory, ie don't put them into any folder and don't copy the folder they were in.
The following files should be on the root of your memory card:
･initrd.bin(about 4,337KB)
･zImage.bin(about 1,264KB)
･mversion.bin(about 16KB)
･updater.sh(about 7KB)
･hdimage1.tgz(about 19,734KB)
Turn your Z off. Unlock the battery compartment and take it out for about 60 seconds. Put it back in and use a pen to push the "reset" switch inside. Now put the lid back on and make sure to lock it again.
Now make sure your Z is plugged in to the AC. You don't want to be on battery power and have your Z run out of juice in the middle of the update process. (you can kiss your Z goodbye if that happens). Also make sure your card with the update file is inserted.
The charge indicator should be orange now. Press the On button to turn your Z on while pressing the OK button on the back.
You should see the maintenance menu and select option 4 to update the rom. Select either 1. CF or 2. SD depending where your update files are. Confirm the update by selecting Y. Wait about 5 minutes after which your Z should reboot. You're done. You should have 1.11 JP ROM now.
