Zero/install/eMMC erase

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    Radxa Zero >  Installation >  Erase eMMC

This guide describes how to erase bootloader on Radxa Zero's eMMC. Unlike normal PC where they have a well established and documented way of booting, in embedded world it is a bit chaotic and everyone carries their own bootloader and boot sequence. To ensure Radxa Zero can boot with microSD the bootloader on eMMC need to be wiped so it won't interfere with the boot process.

Additionally, you can choose to erase the whole eMMC, in case you have some serious errors with the on disk format.

Requirement

Radxa Zero
A PC/laptop running Windows, Linux, or macOS
USB A to C cable or C to C cable, depending on your host

Windows

First, follow maskrom guide to setup and load factory-loader.img:

You can then click Erase button to erase the eMMC.

Linux & macOS

First, follow maskrom guide to setup and load rz-fastboot-loader.bin.

You are now booted into fastboot mode. Check it by running lsusb:

   Bus 001 Device 051: ID 18d1:0d02 Google Inc. Celkon A88

Now execute the following commands to wipe bootloader from eMMC:

macOS:

fastboot flashing unlock_critical
fastboot flashing unlock
fastboot erase bootloader
fastboot erase bootloader-boot0
fastboot erase bootloader-boot1
fastboot reboot

Linux:

sudo fastboot flashing unlock_critical
sudo fastboot flashing unlock
sudo fastboot erase bootloader
sudo fastboot erase bootloader-boot0
sudo fastboot erase bootloader-boot1
sudo fastboot reboot

Some commands will fail and this is normal.

Additionally, if your eMMC is corrupted (for example, getting ** Invalid partition 1 ** error in U-Boot message), you can try erase the whole eMMC. You can run the following commands instead: