Sorry for resurrecting this ancient thread, but as someone who had grief with the Aigo A215 player myself, I thought I'd better share my experience of getting two of the things working. (This thread is the top result on google for Aigo A215.)
Aigo used to have a link to the firmware updater utility on their site, but it has since disappeared. The utility they had also had a broken installer, so never really worked. But you can still run it to update your player! I've uploaded it on driverguide here (edit- can't post URL's as I'm a new member! but it should be the number one result for aigo a215, other devices, drivers and firmware.) (Driverguide needs free registration, and the package also requires unpacking with 7-zip, which is free, open source.)
I've outlined the procedure in the driverguide description, but it boils down to unpacking the installer and all files, copying all the files from the "Binary" folder to the "Apps" folder, then running stupdaterapp.exe, and plugging in the mp3 player in recovery mode (hold down play button while plugging in, keep holding it for 10 seconds or so.)
If windows wants to look for a driver when you plug it in in recover mode, point it to the Apps folder.
This should allow you to update the firmware, but the player still won't work (for me, at least,) in MTP mode (which is a pretty crap mode for MP3 players anyway.) I don't know why, it's just implemented badly, and crashes upon attempting any transfers.
You can, however, use a computer that doesn't have Windows Media Player 10 or 11 installed, and it will show up as a USB mass storage device (with a drive letter, like a USB key, THE BEST way to operate an mp3 player.)
Even if you have windows media player installed, you can tell windows to use the MSC driver instead. Assuming XP, go to device manager, find the Mp3 player, right click, update driver, install from a specific list or location, don't search i will choose the driver, then select the MSC driver.
Congratulations, you should now have a properly working MP3 player that shows up as a drive letter for drag and drop operation.