I have removed the SD card from my AVH-4200NEX headunit. The pupose is to backap the image file. However, using an SD card reader, the stock SD card is not detected in WIndows. The SD card reader is working with other SD cards. So how to backup the stock SD card in Windows 11?

I installed Ubuntu WSL (in windows 11) but the stock SD card is still not detected.

Any help would be greatly appreciated.

If you pulled this card from a working 4200 then the card is password protected. Once you place the stock sd card in a unit and turn it on the unit it will protect the card. 

3 hours ago, Datsun said:

If you pulled this card from a working 4200 then the card is password protected. Once you place the stock sd card in a unit and turn it on the unit it will protect the card. 

Thanks, Datsun, for the info. Does this mean that there is no way to duplicate a working stock sd card?

I have seen some people here that say they know the password code to unlock the sd card, but I do not know it and I don’t even know how to unlock it even if I did. There are far smarter people than me that show up from time to time that could maybe help, but unfortunately that person is not me. Sorry I cannot help any further, that is all I know.