Xiaomi Redmi 7 is a popular budget smartphone, but even years after its release, users are faced with the need to reflash it. The main problem: a locked bootloader, which Xiaomi blocks by default “for security.” Without it, installing custom firmware or even official software through Fastboot is impossible.
In this article, we’ll look at the current ways Redmi 7 (codenamed onc) can be installed, with all the constraints of 2026, from official unlocking through the Mi Unlock Tool to workarounds for devices where the standard method doesn’t work. We’ll break down the unique Mi Account authorization bug on older versions of MIUI that prevents unlocking, and show you how to get around it without losing data.
Important: the procedure requires preparation. If you have never worked with ADB, Fastboot or custom firmware, carefully study each step. Mistakes in the unlocking stage of the bootloader can lead to a complete loss of functionality of the device ("brick").
Why Redmi 7 bootloader is locked and can it be unlocked?
Xiaomi is blocking the bootloader on all its devices, including the Redmi 7, for two reasons:
- 🔒 Protection against theft: without unlocking the attacker will not be able to erase data or reflash the phone.
- 🛡️ Firmware Control: The company wants users to install only official software through the company. MIUI Updater.
However, unlocking is possible – Xiaomi provides the official Mi Unlock Tool tool, but with a number of restrictions:
- ⏳ Wait 7–30 days after linking your account to your device (depending on version) MIUI).
- 📱 Mandatory authorization in the Mi Account on the phone before unlocking.
- 🔄 Limit the number of unlocks: one account can unlock no more than 1 device in 30 days.
⚠️ Attention: Redmi 7 with version MIUI Below 12.0.3, a bug is possible in which the Mi Unlock Tool does not see the device even after the account is attached. The solution is to update the software through Recovery or use alternative methods (described below).
If the official method doesn’t work, informal methods remain, but they require:
- 🔧 Ability to work with ADB and Fastboot.
- 📥 Availability of data backup (unlocking wipes everything from the device).
- 💻 Windows computer (for Mi Unlock Tool).
Preparation for unlocking: what to do before the firmware
Before you start unlocking, follow the mandatory steps:
- Create a backup copy: 📱 Use Mi Cloud or Google Account to sync your contacts, photos and apps. 💾 For full backup (including) SMS and settings will do the utility. TWRP, But it can only be installed after unlocking the bootloader.
- Check out MIUI version: Go to Settings → About Phone → MIUI version. If version is older than 12.0.3, update it through Settings → System Update.
- Activate debugging on USB: Turn on Developer Mode (7 times click on Version) MIUI), then in Settings → Additionally. → For developers, activate: 🔌 Debugging by USB 🔓 Unlocking OEM (point-of-point!)
Link the Mi Account
Go to Settings → Xiaomi account and log in. Without this, the Mi Unlock Tool will not work.
Make a data backup|Update MIUI up-to-date|Enable debugging on USB unlock OEM|Linking your Mi Account to your device|Install drivers ADB/Fastboot PC-only-->
If the error "Couldn't verify device" occurs at the linking stage, it is a sign of an authorization bug.
- Turn off USB debugging and restart your phone.
- Go to Settings → Xiaomi Account → Security and click “Add Device”.
- Connect your phone to your PC and re-enable Debugging over USB.
⚠️ Note: If you are using Redmi 7 china-fixed (MIUI China, you will need a Chinese account to unlock Mi. Change region to Global via Settings → Additionally. → Region. Official way: Unlocking through Mi Unlock Tool is the most reliable method, but it requires patience. Follow the instructions: Download Mi Unlock Tool: The official utility is available on the website en.miui.com/unlock. Choose the version for Windows (on the Mac/Linux Install drivers: When you first connect your phone to your PC in Fastboot mode, Windows will request drivers. Download them from the Mi Unlock Tool archive or use Mi. PC Start the utility and log in: Log in to the same Mi Account that's linked to the phone. If the utility says "Account not bound," repeat the link on the phone. Turn your phone to Fastboot: Turn off the device, then press Power + Volume down until the Fastboot logo appears. Connect your phone to your PC. Start unlocking: In Mi Unlock Tool, press "Unlock." If you have a waiting message, wait until the specified time (usually 7 days). Message in Mi Unlock Tool Reason Couldn't unlock. Wait for 168 New Device account Wait for 7 days, periodically synchronizing data with Mi Cloud is the account in different account Device on your phone, re-locked account and re-on-cataskate on your PC. Unable to unlock Not enabled unlocking OEM Enable in the developer settings, try Network error Problems with Xiaomi servers Try later or use VPN (China region) Once successfully unlocked, the phone will automatically reset to factory settings. You can now install custom firmware via Fastboot or TWRP. 💡Official unlocking via Mi Unlock Tool is the only method that guarantees safety IMEI operation of all modules (NFC, Unofficial methods of unlocking the bootloader If the Mi Unlock Tool does not work (for example, due to the error "Couldn't verify device" on older versions). MIUI), You can try alternatives. They're more risky, but sometimes they save the day. Method 1: Bypassing your account through a network. ADB Suitable for devices where the Mi Unlock Tool can’t see the phone due to authorization issues. adb shell su setprop persist.service.adb.enable 1 setprop persist.service.debuggable 1 setprop persist.sys.usb.config mtp,adb After executing commands, restart your phone and try again to unlock via Mi Unlock Tool. 2: Using a patched Fastboot for power users.Requires: 📥 Downloaded patched_boot.img for your version MIUI (search the forums XDA Developers or 4PDA). 💻 Fastboot utility from Android SDK Platform Tools. Instructions: Transfer your phone to Fastboot (Power) + Volume reduction. In the command line, do: fastboot flash boot patched_boot.img fastboot oem unlock-go Reboot device: fastboot reboot. ⚠️ Note: This method can lead to loss DRM-The keys that will stop working Widevine L1 (no HD into Netflix/YouTube) and NFC (No contactless payment will work. DRM-Keys and why losing them is critical? DRM-Keys are unique identifiers that are tied to the hardware of a smartphone: - 🎬 High-resolution video playback (Widevine) L1 → HD, L3 → only 480p). - 💳 Work. NFC Contactless payments (Google Pay, SberPay). - 🔐 Content protection in some banking applications. If you lose your keys, you can only restore them through the official firmware with the bootloader locked (but then you will need to unlock again: 📱 Official firmware via Mi Flash Tool (restore) DRM-keynote). 🛠️ Custom firmware (e.g. LineageOS, Pixel Experience) via TWRP. ⚡ Modified core (for example, to overclock the processor or improve autonomy). Install official firmware through Mi Flash Tool The safest way to return the phone to the “factory” state: Download Fastboot firmware for Redmi 7 (onc) from Xiaomi Firmware. Unpack the archive into a folder without Cyrillic characters (e.g, C:\MIUI\). Run the Mi Flash Tool, select the firmware folder, and connect the phone in Fastboot mode. Press Refresh, then Flash. Select the "Clean all" option. Install custom firmware through TWRP For enthusiasts willing to sacrifice stability for new features: Download TWRP for Redmi 7 (version 3.7.0 Install it with Fastboot: fastboot flash recovery. twrp-3.7.0-onc.img fastboot boot twrp-3.7.0-onc.img V TWRP run the Wipe → Format Data (required!), then install it. ZIP firmware. 💡Before installing custom firmware, check its compatibility with the Redmi model. 7 (codename). Firmware for Redmi 7A (pine or Redmi Note 7 (Lavender) will not work and lead to a breeze! Frequent errors and their solutions Even with accurate follow-up to the instructions can cause problems. Consider the most common: Error Reason Fastboot solution: Unknown command 'oem unlock-go' Unsupported version of Fastboot Update Platform Tools to the latest version of Anti-rollback check fail Attempt to install old firmware Use firmware no older than the current version of Anti-Rollback Phone not turned on after firmware Incompatible firmware or Repeat the firmware through the Mi Flash Tool with the option "Clean all" Device is not authorized in the ADB Unconfirmed. RSA-Key on the phone Disable / turn on debugging USB and confirm access on the phone screen if after the firmware is missing IMEI Serial number: Check if the folder is saved /efs (If so, restore it through TWRP). If not, use the utility. SN Write Tool (requires an authorized Mi Account and backup) IMEI). ⚠️ Attention: Recovery IMEI through SN Write Tool can be considered a fraud by the operator. Use only for personal devices! FAQ: Frequently asked questions: Can you unlock a bootloader without waiting 7 days? Officially no. Xiaomi has introduced this restriction to protect against theft: 🔄 Multiple account binding/unbinding (risk of blocking the account). 📡 Use of the VPN But there are no guarantees - Xiaomi regularly closes such loopholes. What if Mi Unlock Tool says "Couldn't verify device"? This error is typical for Redmi 7 on older versions? MIUI. Solutions: Update MIUI Up to the latest version through Recovery. Delete your Mi Account on your phone, reboot, then log in again. Use an alternate version of the Mi Unlock Tool (e.g. 4.5.818.51 instead of the last one). Can you flash Redmi 7 without unlocking the bootloader? Partly - yes. The following options are available: 📲 Update via Settings → Update of the system (official firmware only). 🔧 Install Recovery firmware through Stock Recovery (without loss of data, but with limitations). Unlocking is mandatory for custom firmware or modified cores. How to return official firmware after custom? Use Mi Flash Tool with the "Clean all" option: Download the Fastboot firmware for your model from the official website. Unpack it into a folder with no spaces on the way. Connect your phone in Fastboot mode and start the firmware. NFC Widevine, which means they were lost. DRM-keynote. You can only restore them through the firmware with the bootloader locked (but then you will need to unlock again). 4PDA? Patch firmware (e.g., with pre-removed restrictions) may: ✅ Accelerate unlocking of the loader. ❌ Contain spyware or viruses (the risk is especially high for firmware from unknown authors). ⚠️ Lead to loss of warranty or blocking of Mi Account. Recommendation: use only firmware from verified sources (XDA Developers, Official Repositories of LineageOS).