Users of the Moto G64 5G India experiencing issues flashing Magisk-patched boot images created with versions 28.0 or 28.1 are encountering a “Preflash validation failed” error. This issue appears to be a compatibility problem introduced in Magisk v28+, as flashing boot images patched with v27.0 succeeds without errors.

This guide details the steps to reproduce this issue, the expected and observed behavior, and provides resources for further investigation.

## Device Information:

* **Device Model**: Moto G64 5G India
* **Android Version**: 14
* **Bootloader Status**: Unlocked
* **Firmware Version**: CANCUNF_G_SYS_U1TDS34.100_46_7_2 (Latest)
* **Magisk Version**: v28.0, v28.1 (fails), v27.0 (works)
* **Fastboot Version**: fastboot version 35.0.2-12147458

## Steps to Reproduce:

1. Extract the stock `boot.img` from the device firmware.
2. Patch the `boot.img` using Magisk v28.0 or v28.1.
3. Flash the patched boot image via fastboot:
```
fastboot flash boot magisk_patched.img
```
4. Observe the error:
```
Preflash validation failed
```
5. Repeat steps 2-4 using Magisk v27.0 to patch the `boot.img`.
6. Flashing will succeed without errors.

## Expected Behavior:

The Magisk-patched boot image created with v28+ should flash successfully, mirroring the behavior observed with v27.

## Observed Behavior:

* Magisk v28+ patched boot image results in “Preflash validation failed.”
* Magisk v27 patched boot image flashes successfully.

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