How to Refuse Xiaomi Mijia G1: Official and alternative methods

Xiaomi Mijia Laser Projector Laser Projector G1 (Mi Laser Projector 150′′ remains a popular device among users, despite the release of new models, its main advantages are the brightness of 5000. ANSI lumen, support 4K HDR and embedded MIUI TV Android-based TV. However, over time, owners are faced with the need to reflash the device: someone wants to update the outdated version of the software, someone – to restore performance after a failure, and some are trying to install custom firmware for advanced functions.

Mijia's Flashing Process G1 It has its own nuances: the device does not support standard methods like fastboot or ADB sideload, and official updates are distributed through closed channels, and in this article we will discuss all the current ways of flashing, from automatic updates over the Internet to manual restoration through the Internet. USB. Special attention will be paid to the risks of brick (turning the projector into a “brick”) and how to avoid them.

Preparation for reflashing: what you need to know

Before you start the update, check the current firmware version of your Mijia. G1. For that:

1. Go to Settings → About the device → Software version.
2. Write down the assembly number (for example, MIUI TV 2.0.123.456).
3. Compare it to the latest available versions on Xiaomi’s official website.

If your version is older than yours 2-3 updates, it is not recommended to skip intermediate releases - this can lead to conflicts of system files:

• 🔋 Battery charge (if the projector is on the battery) or uninterrupted power supply - the process should not be interrupted.
• 📁 Backup of settings and applications (via Settings) → Backup).
• 🔌 Cable USB Type-A 2.0 (not 3.0!) format → Type-A for hand-held firmware.
• 🖥️ Windows computer 7/10/11 (alternative methods).

Important: projectors Xiaomi Mijia G1 with regional locks (e.g., Chinese versions for the domestic market) may lose functionality after firmware is installed on the global version:

• MDZ-21-DA — international.
• MDZ-21-DB — Chinese version (extremely cautious!).

Official update via the Internet (OTA)

The easiest and safest way is to automatically update by air (OTA). He's a good fit if:

• 🌐 The projector has a stable connection to Wi-Fi.
• 🔄 The current firmware is not damaged (the device is turned on and running).
• 📥 Free memory capacity of at least 1 GB.

Instructions:

1. Connect the projector to a Wi-Fi network (preferably 5 GHz for stability).
2. Go to Settings → About the device → System update.
3. Click Check for updates.
4. If a new version is available, confirm the download and installation.

It takes 15 to 40 minutes depending on the speed of the Internet, so don't turn off the power or press the buttons on the remote during installation, and the progress bar will be displayed on the screen.

💡

Officially OTA-Updates are tested by Xiaomi for compatibility with your model, which minimizes the risk of errors.

If the update is not available, try:

• 🔄 Reboot the projector and router.
• 📡 Connect to another Wi-Fi network (sometimes the provider’s locks interfere with the download).
• 🕒 Wait 1-2 Updates can be released in waves by region.

Hand-held firmware through USB (restoration)

If automatic update is not available or the projector is not turned on, use the manual method through the USB. You will need an official firmware file in.zip (not.img) format!).

Where to get firmware:

• 🔗 Official Xiaomi website (section "Projector").
• 📁 XDA-Developers Forums (Look for Mijia themes) G1).
• 💾 Archives with firmware from enthusiasts (for example, 4PDA).

Important: the name of the firmware file should match the model, for example, for the international version, the file type will suit. mijia_g1_global_V12.0.1.0.QCFCNXM.zip. The wrong file will cause an error: E:footer is wrong.

Installation instructions:

1. Turn off the projector and insert the flash drive into the port USB 2.0 (usually located at the back).
2. Press the Menu button on the remote. + OK And while holding them, turn on the projector.
3. Release the buttons when the Mi logo and recovery menu appear on the screen.
4. Select Apply update from USB (navigation – volume buttons, confirmation — OK).
5. Confirm the installation and wait until the completion (about) 10-15 minute).

Once installed successfully, the projector will restart. If the process is stuck in the Verifying update package, try:

• 🔄 Rename the firmware file to update.zip (register!).
• 📁 Check the checksum (MD5) File (must match the one on the site).
• 🔌 Use the other USB-The drive (preferably original from Xiaomi).

Alternative methods: ADB and Fastboot

Mijia projectors G1 do not support standard fastboot modes or ADB sideload because of the closed architecture, but enthusiasts have found workarounds through the hidden engineering menu.

This will require:

• 🖥️ Computer with drivers installed ADB (You can download it in Android Studio).
• 🔌 Cable USB-A → USB-A (plug-in).
• 📄 Firmware file in.img format (not.zip!).

Instructions:

1. Turn on the projector mode debugging on USB: Settings → About the device → POS version → Press 7 times on "Build Number" Then return to Settings → Additionally. → For developers → Debugging by USB.
2. Connect the projector to the PC and check the connection command: Adb devices should display the device with the serial number.
3. Reboot the projector in fastboot mode: adb reboot bootloader
4. Squeeze the image with the team (replace it) firmware.img The name of your file: fastboot flash system firmware.img

💡

If the fastboot flash command doesn't work, try unlocking the bootloader first with the fastboot oem unlock command. Note, this will erase all data!

Warning: This method is risky! The wrong command can lead to:

• 🚨 Loss of warranty (if the device is under warranty).
• 🔴 Permanent locking of the loader (hard brick).
• 🖥️ Incapacity to work HDMI-port or Wi-Fi module.

Recovery after a failed firmware ("brick")

If the projector doesn't turn on, flashes a red light or hangs on the Mi logo, don't panic - in 80% of cases, the device can be restored.

For recovery through recovery mode:

1. Turn off the projector from the socket for 30 seconds.
2. Put the flash drive in. update.zip.
3. Press the Power button on the body and, holding it, connect the power.
4. Release the button when the recovery menu appears.
5. Choose Wipe. data/factory reset, then Apply update from USB.

💡

If the recovery menu does not appear, try using the emergency cable with the closure of contacts. GND and RECOVERY on the motherboard (disassembly is required).

Note: If the projector produces an E:signature verification failed error, it means that:

• The firmware file is corrupted or not intended for your model.
• Integrity of the loader (attempt to install custom firmware) is violated.

In this case, only the official Xiaomi service center with access to internal firmware tools will help.

Castom firmware: risks and opportunities

Install unofficial firmware (such as LineageOS or OpenTV) on Mijia G1 permitting:

• 🎮 Install Google Play Store and apps not available in standard firmware.
• 🔧 Set up processor overclocking or change resolution.
• 📺 Add support for new codecs (e.g. Dolby Vision).

But there are also serious risks:

• 🚫 Loss of support for official updates.
• 🔊 Sound problems (some custom firmware does not support Dolby Atmos).
• 🔒 Lockdown DRM (Widevine L1), Why Netflix and Disney are+ They will work in low resolution.

The most popular custom firmware for the Mijia G1:

Instructions for installing custom firmware:

1. Unlock the bootloader via fastboot oem unlock (this will erase all data!).
2. Install custom recovery (TWRP) Team: Fastboot Flash Recovery twrp.img
3. Boot in. TWRP (minus + Power when powered on).
4. Make a backup of the current firmware (Backup in TWRP).
5. Sweep the custom firmware through Install.

💡

Custom firmware deprives you of official support Xiaomi. In case of failure, repair warranty will be impossible.

Frequent mistakes and their solutions

Even when following instructions, users face problems. Consider the most common ones:

E:footer is wrong

• 📁 The firmware file is corrupted – download it again and check it MD5.
• 🔄 Rename the file to update.zip (gapless!).
• 💾 Use a USB flash drive no more than 32 GB formatted in FAT32.

Error: Projector does not turn on after firmware

• 🔌 Turn off the power for 1 minute, then try again.
• 🔄 Try to flash an older version of the software, then upgrade in stages.
• 🛠️ If the indicator flashes red - repairs are required in the service.

Error: No sound after the update

• 🔊 Go to Settings. → Sound. → Output format and select Auto (HDMI).
• 🎵 Reset the sound settings to factory.
• 📻 Update the firmware again – it is possible that the audio driver files are not installed.

FAQ: Answers to popular questions