The Xiaomi Redmi 4X (codenamed santoni ) is widely regarded as one of the most durable and battery-efficient budget smartphones ever released. Even years after its launch, millions of users still rely on it as a daily driver or a secondary device. However, due to its age and the custom ROM community surrounding it, users often encounter a terrifying problem:
Using a hex editor or Qualcomm tools ( mbn_parser , modem_unpack ), the file can be dissected into: redmi 4x modem file
Frequently, installing custom Android versions can break signal compatibility, requiring a manual re-flash of the stock modem. The Xiaomi Redmi 4X (codenamed santoni ) is