Warmly Tips: Limited by Android 8 and higher version, the phones with Android 8 and higher version cannot flash the lower version( www.vivo.com
The error is a security lockout, not a death sentence for your device. By understanding that it points to an overloaded authentication buffer or exhausted credits, you can take targeted action: reset EDL mode, use a correct signed loader, reauthorize your tool, or clear the loader cache via test points. vivo loader daauth file full