I have problem with AAC/M4a and WAV files in my newly bought CD6003

I'm trying from my pen drive, I tried a lot of time today but they are not being detected by the 6003.
From the CD6003 Manual:
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AAC is an abbreviation for Advanced Audio Coding. It is the basic format related to the audio compression technology used in MPEG-2 and MPEG-4.
Playing of AAC files that have the extension .m4a encoded using iTunes is supported with this device.
However, files may be unable to be played due to having DRM copy protection (copyright protection) or because of the version of iTunes they have been encoded with.
iTunes is a trademark of Apple Inc. that is registered in the US and other countries.
This applies to files created with iTunes.
Titles, artist names, and album titles are displayed as text information.
The TEXT display is alphanumeric only. If nonalphanumeric characters have been recorded, the characters will be displayed as *.
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Most likely reason for your player refusing to play said AAC files is it is DRM-locked. You will have similar issues with Windows Media Audio DRM-locked files. May be iTunes can show if a track is DRM locked. I don't know, I'm just guessing out loud.
To test: rip some songs from any audio CD as mp4, put this song(s) in pen drive or burn to CD, and check if they play on your CD6003. They should play.
Regarding wave files, right click on the said wave file and in properties, go to summary and check if the bit rate is 1411 kbps, 16 bit, 2 (stereo), 44 or 48kHz. Higher bit rates and higher sampling rates are not supported though the Cirrus Logic DAC chip inside it very much supports 24 bit/192kHz.