Erase SPI Flash

Method 1： Erase SPI Flash on Board

Boot Linux from SD card or eMMC, log in to the system, and confirm that the SPI flash can be read.

ls /dev/mtdblock*
Under normal circumstances, it will return /dev/mtdblock0, and then execute the clear command.

sudo dd if=/dev/zero of=/dev/mtdblock0
sync

Method 2: Under Linux PC / Mac

First, put the device [into MaskRom mode] (./maskrom.md), then connect the PC and the device via USB cable. Then download zero.img and unzip it, then execute the following command

rkdeveloptool db rk3588_spl_loader_v1.08.111.bin (other devices need to select the corresponding loader file)
rkdeveloptool wl 0 zero.img
rkdeveloptool rd

Method 3: Using RKDevTool under window

First, put the device into MaskRom mode, then open the RkDevTool tool, select "Advanced Function", and follow the order on the picture below.