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Installation Guide for Rakuten Mini c330ae ​

INFO

これは英語版の記事です。日本語版はこちらを参照して下さい。

WARNING

Flashing a custom ROM will erase all data on the device, including apps, settings, and system files. Make sure to back up any important data before proceeding.

Make sure you are running the latest stock ROM ​

WARNING

This custom ROM was developed based on the latest update released for the Rakuten Mini. To avoid issues, always return to the final stock ROM version, C330AE_9.0_RMN_JP_115_SS, before the initial installation.

Installation may fail if the device is in a state such as the following, so please avoid these situations:

  • The device is still running an older version of the stock ROM.
  • A GSI such as crDroid has been installed using AndroPlus's vendor_72_mod.img.
ABC12345XYZ device
  • Once the download is complete, run the following command to reboot into the bootloader:
bash
adb reboot bootloader

Install the stock ROM from Fastboot mode ​

  • Open a terminal or Command Prompt on your PC and run the following command:
bash
fastboot devices
  • If the device is detected, a unique identifier followed by the word fastboot will be displayed:
ABC12345XYZ fastboot
  • Run the following command:
bash
fastboot update --skip-reboot Fastboot_c330ae_C330AE_9.0_RMN_JP_115_SS.zip
  • Once flashing is complete, wipe the device data and reboot:
bash
fastboot -w
fastboot reboot
  • Confirm that the device reboots successfully into the factory Android 9 system.
  • Open the Settings app, scroll down, and go to About phone. Confirm that the Software version shown near the bottom is C330AE_9.0_RMN_JP_115_SS.

What to do if flashing fails and the device does not boot ​

  • If the device does not boot, the flashing process may have failed. In that case, hold the Volume Up key to reboot into recovery mode.
  • Use the volume keys to highlight Reboot to bootloader, then press the power key to return to the bootloader screen.
  • Repeat the steps in the section above, "Install the stock ROM from Fastboot mode."

WARNING

Immediately after installing the stock ROM, make sure the device can boot normally. Do not continue with the steps below unless you have confirmed a successful boot. Otherwise, the device may become unrecoverable.

Install the recovery images ​

  • Enable USB debugging on the device. If it is enabled correctly, the device should appear as follows:
ABC12345XYZ device
  • Run the following command to reboot into the bootloader:
bash
adb reboot bootloader
  • Open a terminal or Command Prompt on your PC and run the following command:
bash
fastboot devices
  • If the device is detected, a unique identifier followed by the word fastboot will be displayed:
ABC12345XYZ fastboot
  • Make sure the image files (boot.img, dtbo.img, and recovery.img) are in the same directory as the terminal or Command Prompt you are using.
  • Run the following commands:
bash
fastboot flash boot boot.img
fastboot flash dtbo dtbo.img
fastboot flash recovery recovery.img
  • After flashing all three images, use the volume keys to select Recovery mode, then press the power key to reboot into recovery.

Format the data partition ​

WARNING

Formatting the data partition will erase all user files and settings. Make sure you have backed up your data before proceeding.

  • Select Factory reset > Format data/factory reset. This will format the data partition.

Install the ROM ​

  • Press the ← button in the upper-left corner to return to the main menu.
  • Select Apply Update > Apply from ADB.
  • On your PC, navigate to the directory containing the ROM file.
  • Open a terminal in that directory.
  • Run the sideload command:
bash
adb sideload <filename>.zip

INFO

This may take several minutes.

  • Once installation is complete, return to the recovery main menu.
  • Select Reboot system now.