Use RKdevTool Download Boot Failed

#1

Device:Rock pi 4b+
After the board is powered on, only the green light is on, and the system is not started. There is no response after inserting the SD card and pressing Maskrom to boot. If you fail to use RkDevTools to flash the computer, it prompts Download Boot Fail.
Log:

17:15:10 084 RKDevTool v2.6.9.0 start run
17:15:53 632 RKDevTool v2.6.9.0 start run
17:18:32 932 RKDevTool v2.6.9.0 start run
17:25:48 165 RKDevTool v2.6.9.0 start run
17:26:57 973 Layer<1-3>:Download Boot Start
17:27:04 105 <LAYER 1-3> ERROR:Boot_VendorRequest–>DeviceIoControl failed,Total(71682),Sended(69632),bRet(1),err(0)
17:27:04 106 <LAYER 1-3> ERROR:DownloadBoot–>Boot_VendorRequest471 failed,index(0)
17:27:04 110 Error:Layer<1-3>:Download Boot Fail
#2

ROCK Pi 4B+ has on board eMMC, when flashing/writing images from USB to eMMC, don’t insert the SD card. You don’t need SD card actually.

#3

我是已经安装了ubuntu20.04系统，现在要升级到最新的系统时遇到同样的问题，进入了maskrom模式并且工具发现了设备，但是各种操作都是失败。
以下是log：

09:41:21 984 Layer<2-2>:下载Boot开始
09:41:27 072 <LAYER 2-2> ERROR:Boot_VendorRequest–>DeviceIoControl failed,Total(153602),Sended(0),bRet(1),err(0)
09:41:27 075 <LAYER 2-2> ERROR:DownloadBoot–>Boot_VendorRequest471 failed,index(0)
09:41:27 083 Error:Layer<2-2>:下载Boot失败
09:41:27 167 Layer<2-2>: RunProc is ending, ret=0
09:41:34 988 Layer<2-2>:下载Boot开始
09:41:40 057 <LAYER 2-2> ERROR:Boot_VendorRequest–>DeviceIoControl failed,Total(73730),Sended(0),bRet(1),err(0)
09:41:40 058 <LAYER 2-2> ERROR:DownloadBoot–>Boot_VendorRequest471 failed,index(0)
09:41:40 062 Error:Layer<2-2>:下载Boot失败
09:42:03 457 <LAYER 2-2> ERROR:Boot_VendorRequest–>DeviceIoControl failed,Total(153602),Sended(0),bRet(0),err(1f)
09:42:03 458 <LAYER 2-2> ERROR:DownloadBoot–>Boot_VendorRequest471 failed,index(0)