Standard formatting destroys the hidden boot region that the NSDDW61 device requires. You need a repack , which is a sector-by-sector restoration of the original card image.
Contact the device manufacturer. Many (especially Chinese car radio brands) will email you an official NSDDW61 repack image if you provide proof of purchase and the serial number. Xtrons and Eonon are known to do this for free. nsddw61 sd card repack
list disk
: These head units often require a 16-digit ERC (Electronic Recovery Code) to unlock the system after a power loss. Sellers typically provide both the SD card and the corresponding unlock code as a package. Standard formatting destroys the hidden boot region that
Do not just drag files. You must use dd or NxNandManager to write the BCPKG back to the SD card's hidden sector . Many (especially Chinese car radio brands) will email