Hi,

The Linux Unbricking procedure does NOT work. Fortunately I found a way that did. This might even work for MAC users, YMMV.

** PLEASE WAIT UNTIL THIS IS VERIFIED BY FRIENDLYELEC **
** YOU HAVE BEEN WARNED **

NOTE TO FRIENDLYELEC
    1. Command 4. was modified, since its purpose was to erase the flash.
    2. An extra command 5. was needed to upload the MiniLoaderAll.bin, I could not get it to work without.
    3. Please update the WIKI accordingly.
    4. Please create a section for RK3576, there is none.
    5. Please ask service@rock-chips.com to make the Linux tool available for the Rockchip/arm64, so we can debrick from a NanoPi-T6 for example. I dont use x64 unless I have to.


16.2.2 Installation for upgrade_tool
Using the following commands:

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tar xzf upgrade_tool_v2.30_for_linux.tgz
cd upgrade_tool_v2.30_for_linux
sudo cp upgrade_tool /usr/local/sbin/
sudo chmod 755 /usr/local/sbin/upgrade_tool

16.2.3 Enter Maskrom Mode to Erase the Storage Device
    1. Connect NanoPi-R76S to the computer using a USB data cable.
    2. Disconnect the power from NanoPi-R76S, hold down the MASK button, connect the power, and release the button after 4 seconds.
    3. List devices and their connections it should look similar to this:
    DevNo=1 Vid=0x2207,Pid=0x350b,LocationID=13 Mode=Maskrom SerialNo=

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./upgrade_tool LD

    4. Erase the eMMC with the following command:

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./upgrade_tool EF

    5. Upload the MiniLoaderAll.bin after which the NanoPi-R76S will reboot.

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./upgrade_tool UL MiniLoaderAll.bin

At this point, NanoPi-R76S has been restored to its initial state.
Now it can boot the system normally via SD card or eMMC again.

Good luck!