I have same problem. I have recorded my performance on keyboard (PSR I425) when i transfered it to PC it's in .bup format. and the file is not getting played on PC. how should i solve it?

Question edited for clarity.

https://www.google.com/search?q=yamaha+psr-i425+keyboard+display+problem+solution

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scan your files , check file format too.

Check out your owner's manual. Between pages 85 to 96 it tells you all the information you are seeking. Hope that helps.

The BUP file is proprietary format for each model Yamaha keyboard. Your best solution is to export via MIDI interface and use that format.

The BUP files are yamaha's proprietary back up file format.
Having the appropriate drivers installed, once you make the usb connection from computer to keyboard (yamaha), you should now be able to navigate the Yamaha's files as if it were a drive on your computer. I recommend placing the file in a directory with similar files.
Make a backup beforehand to avoid and problems.

You need to understand what the program is doing.
An MP3 file is a recorded music performance like a phonograph record. A MIDI file is a set of instructions for performing music, like sheet music. The converter program is an attempt to turn the record into sheet music. There is no perfect way to do that. You should have gotten something out of the program, though. It sounds more like a computer problem. Try a very simple sound file, convert it to MIDI, and see if you can get something out. If your keyboard can't read it, try putting any known good MIDI file on the card and read that. Possibly your keyboard will only read certain formats or sizes or speeds of cards. See if the manual tells you anything. It might read FAT16 regular speed cards under 1 GB, for instance, and balk at a SDHC 16 GB NTFS formatted card. So, do some detective work.

You will need the CDROM that should have come with the keyboard when you purchased it. On it will be the drivers that need to be on the computer for it to use the usb. The link to the manual is here:http://www2.yamaha.co.jp/manual/pdf/emi/english/port/psri425_en_om_a0.pdf Please look at page 86. If you don't have the CDROM you may be able to download what you need by contacting Yamaha by email through this link and asking:http://www.global.yamaha.com/support/contact.php I hope this helps.

Yes. You will need to have a MIDI interface on your OC and also select in the sounds control panel of windows that you are using the external synth. The MIDI will expect the PSR to respond to the "general MIDI" assignments.

The BUP is an archiving format proprietary to the Yamaha apparently containg styles as well as note data and conversion is really not easy.

If you can get the instrument itself to spill out MIDI and use a MIDI interface and software to capture it on the PC is the best plan.

Once it is in SMF format you can play it on the PC.

how can i play .bup file in computer?

ok here is the solution!!!!!!!!

• we should have a mic pin and audio cable as shown in this pic
• 
connect these cables,and connect big pin to the piano and small pin to the computer (mic or input jack)

now take windows movie maker (start-all programs-windows movie maker). click on narrate timeline (as a mic icon below windows movie maker).

now click start narration on the pc and play your song on the piano. you can see input level highlights. now your song is recording. when your song completes click stop narration and save to the pc. walah if you can't understand this say to me. i can add video. sry for my worst english