[vpun914]

Originally Posted by ericcmy

mine is also Black/Black, aluminum trim.

I also use USB for connecting my iphone 4 but seem no problem. (because my 523i exec doesn't have bluetooth)

However, I found the sound quality is better by using USB drive for playing MP3 song in comparing with my iphone 4. (Same MP3 song source)

It is the USB drive I use, smallest size, 16G for about 4000 songs.

http://www.verbatim.com.hk/zh_HK/pro...tbook-usb-16gb

I finally solved the problem, it's about the OEM cable, now working perfect with the factory one.

It seems your recommended USB drive is very nice! I'll definitely check it out

[528imsport]

welcome to the forum and have fun.