1) Remove the battery and put it back in your player. It helps sometimes.
2) In some cases, seller of the player is also the manufacturer (who has the firmware). Contact him to find out.
3) Try to find the manufacturer using the photo of your player. I bet there are a lot of players that are the same as yours, only label is different. If you have succeed in that, contact him.
4) You could also contact the "brand" company which have put sticker on your player. In some cases, they have the firmware.
5) Find out which processor your player has (it could require teardown). Then check if some sort of backup utility exist for players based on this processor. If it does exist, contact other people who has the player and ask them to backup their firmware and send to you.
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