A customer recently came to me with a Casio PX-5S that displayed “Error: No Media” after booting, and which wouldn’t produce any sound.
The customer had already researched the issue themselves, and they had determined they needed a firmware update. He’s not alone, and Casio helpfully provides the following message to those with similar struggles: “Well, we’re not 100% certain. […] Casio has worked very hard to try and replicate this problem on units that have exhibited this behavior and have never been able replicate it.” (See their post on Casio Music Forums.)
Once you have the “update.bin” executable file, either by downloading it directly from me or by extracting their archive, you’ll put that file into the root directory of the USB stick. At that point, you can simply plug the USB stick into the keyboard, and the update will automatically begin. It takes about fifteen minutes.
However, my customer inserted the USB stick, and got a further error stating that the update file couldn’t be found. He tried multiple computers and USB sticks.
Various users on Casio’s forums have remedies for this problem, and it seems like they’re all hit or miss. The PX-5S is evidently quite persnickety about its USB sticks. I was able to get it to work using a relatively small and freshly formatted (FAT32) 4GB flash drive. If you’re encountering this error, make sure it’s freshly formatted. It might also be worth trying a smaller USB stick.