Have a look at this link
http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?ctn=CD1503B/17&slg=en&scy=US
should be the support site for that model of phone
Heres a direct link to the user manual
http://download.p4c.philips.com/files/c/cd1503b_17/cd1503b_17_dfu_aen.pdf
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