this is a link to a firmware from the same company in china that also makes a version of the player you have
now it may be that that they uses similar hardware??? as they may have come from the same original factory
worth a try
also, have you emailed CDRking and asked them to try and extract a copy themselves and send to you, they seem hot on having downloads available
http://pasen88.cn/admin/shangchuan/U...6014229847.rar