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Xiaomi Redmi K40S Overview
The Xiaomi Redmi K40S is an Android device from Xiaomi, released in 2022. It combines the Qualcomm SM8250-AC Snapdragon 870 5G (7 nm) and a 6.67-inch display, running Android 12. This page tracks its full specifications, root status, and the bootloader and recovery notes that apply to it.
Root the Xiaomi Redmi K40S
The Xiaomi Redmi K40S is a 2022 Android device from Xiaomi. It runs the Qualcomm SM8250-AC Snapdragon 870 5G (7 nm), a Qualcomm platform with strong community tooling and EDL-mode recovery as a safety net. Shipped software: Android 12, MIUI 13. For this model the realistic path is: the brand-specific unlock described below, followed by Magisk via patched boot image (fastboot). Typical hands-on time is 1–3 hours.
Difficulty
Moderate — brand-specific steps involved
Typical time
1–3 hours
Method
Magisk via patched boot image (fastboot) — KernelSU also viable (GKI kernel)
Bootloader unlock on Xiaomi
All Xiaomi-family unlocks run through the official Mi Unlock tool with a bound Mi account and a mandatory waiting period (historically 72 hours to 30 days). HyperOS added stricter account eligibility rules; nothing legitimate skips the wait.
Platform notes
Qualcomm Snapdragon platforms are the best-supported in the root community: fastboot works as documented, and even a failed flash can usually be recovered through EDL (9008) emergency mode.
Before you start
- Bootloader unlocking factory-resets the device on almost all models — back up everything first.
- Never use the "clean all and lock" option in Mi Flash unless deliberately re-locking on full stock firmware — it is the most common Xiaomi hard-brick cause.
- Anti-rollback protection makes downgrading firmware dangerous on this brand; always flash equal-or-newer versions.
FAQ
Can I root the Xiaomi Redmi K40S?
Yes. The bootloader must first be unlocked with the official Mi Unlock tool, which requires a bound Mi account and a mandatory waiting period. After the unlock, root is Magisk via patched boot image (fastboot).
Does the Xiaomi Redmi K40S support custom recovery (TWRP)?
Popular Xiaomi, Redmi and POCO models usually get TWRP or OrangeFox builds — check that one exists for this exact codename. A custom recovery is optional for root: after the Mi Unlock waiting period, Magisk installs by flashing a patched boot image over fastboot.
Will root the Xiaomi Redmi K40S void my warranty?
Xiaomi will generally treat a rooted Xiaomi Redmi K40S as outside warranty while it is modified. Restoring full stock firmware before a service visit usually restores normal treatment in practice, and consumer law in some regions (such as the EU) may still cover defects unrelated to root.
What Android version does the Xiaomi Redmi K40S run?
It runs Android 12, MIUI 13. The specifications table on this page lists the full software details.
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