This steps does not need xiaomi redmi account. Also no need to unlock boot loader.
The phone will be formatted / erase completely to factory default and all data will be lost.
Steps:
- download and extract the firmware for redmi 9 (The version I've used is V11.0.4.0.QJCMIXM)
- download and install android usb driver New_QcomMtk_Driver_Setup_V2.0.1.1 / UsbDk_1.0.22_x64
- download and install Python for Windows
- download and install libusb-win32-devel-filter-1.2.6.0
- download and extract MTK Bypass Tool mtk_bypass_rev4
- download and extract SP Flash Tool SP_Flash_Tool_v5.1924_Win
Now assuming that the phone can be detected by the Computer in device manager in ports (com and lpt)
- start bypass tool
- start sp flash choose format all and uncheck options for "check lib" and "storage life"
- power off phone
- insert the type c usb cable holding volume down (hold still)
- start bybass tool
- start flash and wait
I've already provided the filenames for you to easily search on google and download them but
I can also provide the download links if you need.
Just ask =)
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