MRT Key Ver 3.77 is a Windows-based software utility used to perform mobile device servicing tasks such as IMEI repair, account removals (FRP/BYU), and flash operations for various smartphone chipsets and brands. Version 3.77 continues the MRT series' focus on broad device support, improved stability, and updated module libraries for newer models.
Unlocking the bootloader is the first step to custom recovery or rooting. MRT 3.77 simplifies this for Xiaomi and Huawei devices, handling the critical "Mi Account" binds and safety checks automatically.
The Spreadtrum chipset is commonly found in budget smartphones and feature phones. This update enhances support for UniSoc (formerly Spreadtrum) based devices, improving the read/write speed and the success rate of unlocking patterns and PINs on these chipsets.