4GB cards should work fine, any card that works in your JBL should also work in your
regular jetBook.
When you remove the SD card do you get the warning message about not removing the
card because the device is updating the file list?
Do you get the same message when you insert the SD card?
If you are getting those messages, it is mostly working and I would look at the issue
likely being getting the update start-up working. The key pressing and holding sequence
can be a source of problems.
Luck;
Ken
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