6.How to upgrade the M33 R2R?

The M33 R2R supports Online upgrade and Local upgrade.

1.Online upgrade

If a new firmware is available and can be detected (with the M33 R2R connected to an available internet), an upgrade notification will show up in the notification center. Tap it to enter the update menu for the online upgrade. If there's no upgrade notification showing up, you can go to the "Technical Support->Firmware Upgrade" menu, and tap the "Check for update availability" to check manually.

2.Local upgrade

Also, the M33 R2R can be upgraded locally by a firmware package. Download the firmware package file from the FIIO website, and copy it to the internal storage of the M33 R2R or an SD card. Go to the "Technical Support->Firmware Upgrade->Local Upgrade" menu, and find the firmware package file to start the upgrade.

Notes:

1.Do not unzip the firmware package file.

2.Before the upgrade, ensure the power of the device is adequate (>30%) so to avoid upgrade failure.

3.If the device goes to the factory mode which cannot detect the firmware, the reason may be that the firmware file is damaged. At this time, press the power button to reboot the device. Re-download the firmware file and restart the upgrade.

[The problem may occur in updating and the methods for solving]

The upgrade process takes about 5 to 20 minutes. After the upgrade, the system automatic rebooting will take 2 minutes, so please be patient.

1.If you encounter the problem that the system is stuck and cannot boot normally after the upgrade, please try a forced restart: press and hold the power button for about 10 seconds until the "FiiO" logo appears on the screen.

2.If you are using online update, the system prompts "invalid image", please go to "built-in storage-android-data-com.android.fiioupdate-files", delete this folder, and try online update again.

3.If the online upgrade fails, you can also try the local upgrade. If there is an error in the local upgrade, the copy or download of the installation package is generally damaged. Please download the installation package again.

4.If you encounter recovery mode, no firmware file is detected issue, the firmware file may be damaged. Please click the power button to confirm and select reboot to restart the device.Please download the installation package again.

5.If you encounter system errors, please enter factory mode to restart/reset the machine:

In the off state, press and hold the M33 R2R volume down button, then plug in the USB charging cable(Or click power button), wait for the device enter fastboot mode. Click volume+/- button and switch to recovery mode. Click the power button to confirm and reboot system to enter recovery mode.

Select Wipe data/factory reset to do the factory reset, select reboot system now to restart the device.