FAQ
TL;DR: Fix Redmi 9 bootloops using 1 tool—mtkclient—via BootROM; “All you have to do is upload the software or at least restore the original recovery.” Restore stock recovery first, or reflash partitions, then reboot. [Elektroda, blahfff, post #19794044]
Why it matters: This helps Xiaomi Redmi 9 owners recover a non-booting, Fastboot-less phone without specialized service.
Quick Facts
- BootROM entry: connect to a PC while holding both Volume keys; the phone is then detected. [Elektroda, blahfff, post #19794044]
- Platform note: Redmi 9 is MediaTek-based; Qualcomm EDL mode does not apply here. [Elektroda, blahfff, post #19793689]
- Tooling: mtkclient (now with GUI) can restore stock recovery or write partitions. [Elektroda, blahfff, post #19794287]
- Pro option: Infinity CM2MT2 is reported to work best on newer MTK devices. [Elektroda, FranekDolas, post #19796244]
- Windows symptom: device may show as “MediaTek COM” and vanish in ~2 seconds. [Elektroda, Kuku1125, post #19793151]
How do I unbrick a Xiaomi Redmi 9 stuck in a bootloop after a failed TWRP?
Use BootROM with mtkclient to restore the original recovery, then reboot. Connect the phone while holding both Volume keys to get detection. If needed, flash the firmware by restoring partitions manually. Start with restoring the stock recovery as the simplest corrective step. [Elektroda, blahfff, post #19794044]
Why does my Redmi 9 only appear on USB for a moment and then disconnect?
You are seeing BootROM, which exposes USB briefly. “Bootrom mode is only available for a moment.” If nothing connects immediately, the phone continues booting and drops the link. Launch your tool first so it catches the handshake at once. [Elektroda, blahfff, post #19794287]
Can I use EDL or deep-flash methods on a Redmi 9 (MediaTek)?
No. Redmi 9 uses a MediaTek SoC, and EDL is a Qualcomm-only service mode. Use BootROM-based tools such as mtkclient instead. [Elektroda, blahfff, post #19793689]
Is ADB an option if I had USB debugging enabled earlier?
No. ADB requires the device to enumerate and stay connected in Android or recovery. In a bootloop without a stable connection, ADB cannot attach. Focus on BootROM-level access and flashing tools. [Elektroda, blahfff, post #19793490]
What is mtkclient, and how does it help here?
mtkclient is an open-source MediaTek tool that connects during BootROM. It can restore stock recovery or write individual partitions. A GUI is available now. Use software for your exact model and the same installed version to avoid mismatches. [Elektroda, blahfff, post #19794287]
Is Infinity CM2MT2 a good alternative if mtkclient doesn’t work for me?
Yes. Users report Infinity CM2MT2 works best on newer MediaTek devices. It is a professional-grade solution and may simplify detection and flashing. [Elektroda, FranekDolas, post #19796244]
How do I enter BootROM mode on the Redmi 9 and start recovery?
Try this: 1. Open mtkclient on your PC. 2. While holding both Volume keys, connect the phone via USB. 3. When detected, restore the original recovery or required partitions, then reboot. [Elektroda, blahfff, post #19794044]
Windows keeps connecting and disconnecting; it fails in 99% of attempts—what should I do?
This is expected timing behavior. One user saw Windows fail to detect the phone 99% of the time. Prep your tool first, then plug in and retry quickly until it catches the short BootROM window. Persistence is part of the process. [Elektroda, Kuku1125, post #19793151]
Can restoring only the stock recovery fix the bootloop without full flashing?
Yes. The recommended first step is restoring the original recovery. It is simpler than a full firmware rewrite and often enough to boot. Use mtkclient to push the stock recovery image, then restart. [Elektroda, blahfff, post #19794044]
Will flashing the wrong firmware version cause more issues?
Avoid mismatches. Use software for your exact model and the same version currently installed. Version mismatches can prevent booting and complicate recovery. Verify build numbers before writing partitions to reduce risk. [Elektroda, blahfff, post #19794287]
I still can’t catch BootROM reliably—should I go to a service center?
Yes, if repeated attempts fail. An unauthorized service center with appropriate MediaTek equipment should handle this quickly. They can restore recovery or flash partitions without Fastboot access. [Elektroda, blahfff, post #19794044]
What finally worked for the original poster with a Redmi 9 bootloop?
They recovered the phone using mtkclient along with a step-by-step video guide. This combination restored normal operation and closed the case. [Elektroda, Kuku1125, post #19809453]
Do Samsung-style “download-mode” or USB jig cables help on Xiaomi?
No. Those cables historically target Samsung mechanisms and have no utility on Xiaomi devices. Focus on MediaTek BootROM workflows instead. [Elektroda, blahfff, post #19793490]
Do I need Fastboot access for this unbrick?
No. The guidance here relies on BootROM detection and partition restore. Restoring the original recovery via mtkclient does not require Fastboot access. [Elektroda, blahfff, post #19794044]
e.g. deep flash / EDL 
Descriptions on forums, e.g. 