Xiaomi Redmi Note 4X firmware via EDL: a complete error-debriefing guide

Firmware on Xiaomi Redmi Note 4X via EDL (Emergency Download Mode) is a last resort when the device does not respond to standard recovery methods, which allows the device to “resuscitate” even when critical firmware failures, logo getting stuck or bootloader errors.

In this article, we will look at all the stages of firmware through EDL, from tool preparation to the final configuration of the system, focusing on common errors (such as SLA Auth or driver problems) that slow down the process in 80% of users, and learn how to bypass the bootloader lock without official permission from Xiaomi (spoiler: it is possible, but with reservations).

If your Redmi Note 4X (codenamed mido) is stuck on the Fastboot screen, doesn’t turn on, or gives a DM-Verity error, this guide will help bring it back to life.

1.What is an EDL mode and when is it needed

EDL (Emergency Download Mode) is a service firmware mode that is activated at the Qualcomm processor level. Unlike Fastboot, it allows you to write firmware directly to the device memory without the bootloader. This is the only way to restore the Redmi Note 4X if:

• 🔄 The smartphone is stuck in a bootloop (a cyclical reboot on the Mi logo).
• 🚫 The bootloader is locked and unlocking via Mi Unlock is not possible.
• 💥 The firmware is damaged after a failed update or root rights.
• 🔧 You need to flash the device with factory settings (for example, for sale).

It is important to understand that EDL- is not intended for the average user, but is used by service centers and experienced enthusiasts.

• ⚠️ Loss of warranty (if the device is still warranty).
• ⚠️ Lock IMEI when using unofficial firmware.
• ⚠️ Complete "brick" if you interrupt the process or choose an inappropriate firmware.

Before proceeding to the instructions, check if your situation is suitable for EDL. For example, if the phone just brakes or doesn't turn on after the battery is discharged, try standard recovery methods first.

2.Preparation: What will be needed for firmware

To run the Redmi Note 4X through EDL, you will need:

Pay special attention to the choice of firmware. For the Redmi Note 4X (mido), only firmware marked mido in the title is suitable.

• 📱 Official firmware: mido_global_images_V12.5.1.0.RDFMIXM_20210310.0000.00_10.0_global
• 🛠️ Castom firmware: LineageOS 18.1 for mido or PixelExperience

Warning: If you choose firmware for another model (like the Redmi Note 4 without the X), the device will turn into a brick.

Download firmware for the mido| model

Install Mi Flash Tool|

Install Qualcomm | drivers

Charge your phone at least 50% |

Backup important data (if the phone is still on)-->

3. Unlock the bootloader: bypass the limitations of Xiaomi

Before you run through the EDL, you need to unlock the bootloader. Xiaomi officially requires:

1. Link the Mi Account to the device.
2. Wait 72-168 hours (depending on Xiaomi policy).
3. Use the Mi Unlock Tool.

But if the phone doesn't turn on, it won't work, and in these cases, you can use a workaround.

• 🔓 EDL Auth Bypass: special firmware patches that bypass account verification. Suitable for firmware based on MIUI 10-12.
• 🔧 Test Point: Physically closing the contacts on the circuit board for forced transfer to EDL. Requires disassembly of the phone.
• 💻 Paid services: Some workshops offer bootloader unlocking for 500-1500 rubles.

Important: with the 2023 of the year, Xiaomi tightened protection.Firmware based on Android 11+ (MIUI 12.5+) can require official unlocking even in EDL- Mode. If your device was updated after the 2021 of the year, the chances of bypassing are minimal.

If you’re not ready to disassemble the phone, try flashing the device through Fastboot first (if it responds to buttons at all). Instructions for unlocking the bootloader via Mi Unlock can be found on Xiaomi’s official website.

4. Installation of drivers and transition to EDL mode

Without the right drivers, Windows won't recognize the phone in 9008 mode.

1. Download the Qualcomm HS-USB QDLoader 9008 drivers at the link above.
2. Turn off driver digital signature verification in Windows: Run a command in the CMD on behalf of the administrator: bcdedit/set testsigning on bcdedit/set nointegritychecks on Then restart the PC.
3. Connect the Redmi Note 4X switched off to the PC by holding the Volume Up + Volume Down buttons (for forced EDL).
4. Device Manager should have a device QHSUSB_BULK qualcomm HS-USB QDLoader 9008.
5. Update the driver manually, specifying the path to the downloaded files.

If the device is not determined:

• 🔌 Try another one. USB-port (preferably) USB 2.0 on the back of the PC).
• 🔄 Reinstall drivers by pre-deleting old ones through Device Remove in Manager.
• 💻 Use a different PC (sometimes drivers from other Qualcomm devices conflict).

adb reboot edl

If ADB No response, only Test Point or service center remains.-->

Once the drivers are successfully installed, you can go to firmware. Make sure there are no exclamation points in Device Manager near Qualcomm.

5. Step-by-step firmware through the Mi Flash Tool

Now, let's get to the firmware process itself. Follow the instructions carefully.

1. Unpack the firmware in a folder without Cyrillic characters (for example, C:\mido_firmware\).
2. Run the Mi Flash Tool on behalf of the administrator.
3. Press Select and select the folder with unpacked firmware.
4. At the bottom of the window, select firmware mode: clean all – complete cleaning (recommended in case of failures). clean all and lock – cleaning + locking the bootloader (only for official firmware!). save user data – saving user data (risky in case of failures).

COM-port

Refresh

Flash

The process of firmware in the Mi Flash Tool looks like this:

1. 🔹 Yellow bar — sending files to a device.
2. 🔹 Green stripe is a memory firmware record.
3. 🔹 Flash Done message is a success!

💡

If the Mi Flash Tool gives you an SLA Auth error, your firmware requires you to officially unlock the bootloader. Try a different firmware version or use a patch to get around (see Section 3).

Once the firmware is successful, the phone will automatically restart. The first turn on can take up to 10 minutes - don't interrupt the process!

Typical errors and their solutions

Even if you follow the instructions accurately, you can get errors.

If the Mi Flash Tool is a Critical Error, try:

• 🔹 Run the program in Windows 7 compatibility mode.
• 🔹 Disable the antivirus (it can block access to ports).
• 🔹 Use a different version of the Mi Flash Tool (e.g. 2017).

Note: If the phone vibrates after firmware but the screen remains black, the persist partition is likely to be damaged, in which case only a clean all or a service center re-sweetening of memory will help.

7. What to do after the firmware

Successful firmware is only half the battle.

1. Configure the device as new (do not restore the backup if the firmware has failed).
2. Check IMEI: Enter in the dialer: *#06# If IMEI is missing (Null), run it separately through the SN Write Tool or Maui META.
3. Update your firmware to the latest version via Settings → About Phone → System Update.
4. Set root rights (optional) if you need advanced settings.

If some features (such as NFC or IR- blaster) are missing after the firmware, chances are you were using unofficial firmware. Go back to the official MIUI version for mido.

💡

To avoid problems with your Mi Account after you have firmware, connect to the Internet via mobile data (not Wi-Fi) before you first set up your phone, which will help bypass the account lock on some firmware.

If the phone is unstable (spontaneous reboots, lags), reset to factory settings via Settings → Additional → Restore and reset.

8. Alternative firmware methods

If the firmware through the Mi Flash Tool failed, try alternative methods:

• 🔧 Fastboot firmware: If your phone is responsive to buttons, run it through fastboot using the command: fastboot flash all firmware.zip Detailed instructions are available on XDA Developers.
• 📱 SP Flash Tool: Suitable for firmware via Mediatek, but Redmi Note 4X runs on Qualcomm, so the method is not applicable.
• 🛠️ Firmware via TWRP: If you have custom Recovery installed, you can flash the ZIP- firmware archive directly from the memory card.

For the Redmi Note 4X, the most reliable alternative method is Fastboot firmware, which is less risky than EDL, but requires a workloader. If the phone is stuck on the Fastboot screen but responds to commands, try:

1. Install ADB and Fastboot.
2. Connect your phone to your PC in Fastboot mode (keep Volume down + Power on).
3. Run the command: fastboot oem edl This will put the device in EDL mode, after which you can use the Mi Flash Tool.

If none of the methods worked, you just need to contact the service center.The cost of firmware through EDL in the workshops is 1000-2500 rubles, depending on the region.

FAQ: Frequent questions about the Redmi Note firmware 4X