Introduction to updating firmware

Preface

AIO-3562JQ has 2 working modes. Under normal circumstances, boot
directly into "Normal mode" to start the system normally. If you need
to upgrade the board subsystem, you can choose the appropriate
"Upgrade mode" to upgrade the firmware according to the situation.


Normal mode

Upgrade mode

Among the upgrade modes, the comparison between different upgrade
modes:

MaskRom Upgrade Mode

In general, there is no need to enter "MaskRom Upgrade Mode". Only
when the board failed to boot normally or "Loader Mode" failed to
upgrade. In this mode, the BootRom code will enter this mode. At this
time, the BootRom code waits for the host to transmit the bootloader
code through the USB interface, load and run it. When the bootloader
verification fails (the IDB block cannot be read, or the bootloader is
damaged), it will enter "MaskRom Mode" automatically. You can also
manually enter the "MaskRom Upgrade Mode".

To enter MaskRom Upgrade Mode, please refer to the chapter "MaskRom
Upgrade Mode".

Loader upgrade mode

It is the recommended mode. In "Loader upgrade mode", the bootloader
will enter an upgrade state, waiting for host commands for firmware
upgrades, etc. To enter this mode, the bootloader must detect a
"RECOVERY" key press at startup and the USB is connected.

To enter Loader upgrade mode, see the chapter "Loader upgrade mode".

SD upgrade mode

Using SD upgrade is essentially to make a bootable SD card with
upgrade firmware, let the board boot from SD, erase and upgrade the
firmware to EMMC.

To enter SD upgrade mode, please refer to the chapter "Upgrade
Firmware Using SD Card".