A utility for reading and writing flash contents on Sinowealth 8051-based devices (keyboards and mice) since they all seem to have similar ISP bootloaders.

This is an experimental tool, so use it at your own risk.

⚠️ A read operation will set an LJMP (0x02) opcode at address <firmware_size-5> if it's not already present there. When this opcode is set, the bootloader considers the main firmware enabled and jumps to it when the device is powered on. This opcode should already be set on most devices and therefore the read operation should not cause any issues.

⚠️ During reading the ISP bootloader will redirect values in 0x0001 - 0x0002 to <firmware_size-4> - <firmware_size-3>. Because of this, the produced payload will be different from how memory is actually laid out in the MCU flash.

# reads firmware excluding isp bootloader 
sinowealth-kb-tool read -p nuphy-air60 foobar.hex

# reads only isp bootloader section
sinowealth-kb-tool read -p nuphy-air60 -b bootloader.hex

# full dump including firmware and bootloader
sinowealth-kb-tool read -p nuphy-air60 --full full.hex

# custom device
sinowealth-kb-tool read \
    --firmware_size 61440 \
    --bootloader_size 4096 \
    --page_size 2048 \
    --vendor_id 0x05ac \
    --product_id 0x024f \
    foobar.hex

⚠️ Same as the read operation, the ISP bootloader will write values meant for addresses 0x0001-0x0002 to <firmware_size-4> - <firmware_size-3>.

# overwrites firmware (does not touch the bootloader section)
sinowealth-kb-tool write -p nuphy-air60 foobar.hex

# custom device
sinowealth-kb-tool write \
    --firmware_size 61440 \
    --bootloader_size 4096 \
    --page_size 2048 \
    --vendor_id 0x05ac \
    --product_id 0x024f \
    foobar.hex

To enable running this tool without superuser privileges add the following udev rule with xxxx and yyyy replaced with your device Vendor ID and Product ID respectively.

# /etc/udev/rules.d/plugdev.rule
SUBSYSTEMS=="usb", ATTRS{idVendor}=="xxxx", ATTRS{idProduct}=="yyyy", MODE="0660", GROUP="plugdev"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0603", ATTRS{idProduct}=="1020", MODE="0660", GROUP="plugdev"

Make sure your user is part of the plugdev group.

Thanks to @gashtaan for analyzing and explaining the inner workings of the ISP bootloaders. Without his help, this tool wouldn't be here!