your mp3 is on adfu mode...When you use the adfu.inf that comes in windows....your mp3 is not recognised...the devices is
USB\VID_10D6&PID_FF76\5&2E64F456&0&3 for AK2025...you can edit the adfuupdate.inf...and add this device..
or you can download the mp3 tool 5.3 that comes with a driver for ak2025. When your pc is on adfu mode you can try to
replace the firmware...maybe thats your problem...your firmware is corrupted...If your mp3 comes with the firmware
is very easy to try to restore your mp3...If you don t have the firmware...you can go to
http://bbs.mydigit.cn/read.php?tid=127829
in this site you can download ak2025...firmwares....
I try to update my firmware with 5.3 version and these firmware but I got error and the program exit...So you can try
...may be your are lucky...