Ver 3.77’s Linux kernel footprint is tiny (under 1GB RAM). It boots instantly on old Core 2 Duo machines, making it ideal for batch processing or live-startup environments.
Download the MRT Key Ver 3.77 setup zip file from a trusted GSM hosting forum. Extract the contents using WinRAR or 7-Zip to your desktop. Step 3: Install USB Drivers
For a technician working on phones from that era, version 3.77 was an essential update that improved efficiency and expanded device coverage. While newer versions have since added many more features, the core principles of the MRT Key—using a physical dongle for licensing and offering a comprehensive toolkit for Android repair—remain the same.
+-------------------------------------------------------+ | MRT KEY VER 3.77 | +-------------------------------------------------------+ | | | v v v [Flashing & Software] [Account Lock Removal] [IMEI & Baseband] - Stock Firmware - Mi Account Bypass - IMEI Repair (MTK) - Partition Wiping - Vivo/Oppo FRP Lock - NVRAM Read/Write - Bootloader Unlock - Huawei ID Removal - QCN Reconstruction 1. Account Lock and FRP Removal
Before installing MRT Key Ver 3.77, ensure your workstation meets the following criteria:
: Completely removes persistent Xiaomi MI accounts and deactivates background account verification loops that occur after a factory reset.
The software will detect the COM port, initialize the bootloader bypass, and complete the format operation within seconds. Troubleshooting Common Errors "Dongle Not Found" or "Please Plug In Dongle"
MRT Key is designed primarily for Chinese smartphone brands (Meizu, Xiaomi, Vivo, Huawei, OPPO) and devices utilizing MediaTek (MTK), Qualcomm, and HiSilicon chipsets.
The release of has created a buzz in the repair community, and for good reason. This update brings critical support for some of the most popular devices on the market today.
– Please specify.
Obtain the MRT_3.77.exe or zip file. You can often find these on technical forums like GSM-Forum. Install Drivers:
As of 2026, MRT Lab has discontinued version 3.77 support. However, you may find used hardware keys on secondary markets (eBay, specialized forums). Before purchasing:
Supports IMEI restoration for many MTK-based phones and select Qualcomm models.