How to remove write protect on my usb flash drive

There should be a very small slide switch along the edge of the card. Sliding this one way will lock (write protect) or unlock the card.

your mp3 is damaged im afraid, no other way around it
sorry

On USB stick, there is a "Lock/Unlock" slide bar on the opposite end of USB port. It uses the symbols of a "lock" and an "open hasp lock" to show that the device is "locked" (write-protected) or "unlocked" or not write-protected. remove the lock

Make sure the hold button isn't on. It's as simple as that.

what is the type of your mp3 player ?
it need anew firmware,

I found out that i just had to move the switch on the micro SD card from lock to unlock.

There is a software on internet, it is FREE of charge, it is called unlocker, it's a simple installation that lets you delete, rename, move any file/folder, just right-click the desired file/folder, go to"Unlocker" the image is a wand, and select the option you want.. works for me. good luck. hope this helps

how to remove write protected on my usb flash drive and i have mp3; when plugin into the usb hub it shows a problem occured during installation

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Make sure your mp3 "HOLD" option is not on!
Its really as simple as that. The hold button 'protects' the files.