Mtk Preloader Repair Tool Fixed -

python mtk.py preloader --preloader=preloader.bin

Or for full flash:

python mtk.py wl preloader preloader.bin

Steps:

Modern MTK chips (Helio P60, G80, G95, Dimensity) have security layers: SLA (Secure Layer Authentication) and DAA (Download Agent Authentication). The old Preloader would fail these checks. The MTK Preloader Repair Tool fixed this by injecting a patched "auth bypass" code into the BROM before the security timer expires (within 5-10 seconds).

Many users report that the device disconnects after 2 seconds. A fixed tool uses auto-reconnect logic or "Bootrom Exploit Mode" to keep the connection alive. mtk preloader repair tool fixed

Using mtkclient as an example:

# Check connection
python mtk print
The breakthrough came with the development of specialized BROM-based bypass tools. The MTK Preloader Repair Tool (often integrated into tools like MCT, UnlockTool, CM2 MTK Pro, or the standalone MTKClient) fixed the issue by exploiting a vulnerability in the BootROM (BROM)—a read-only memory that cannot be corrupted. python mtk
Here is exactly how the tool fixed the dead Preloader issue:
The Preloader is the first piece of code that runs when an MTK device boots. If it is corrupted, the device is "dead." The fixed tool forces the device into BootROM (BROM) Mode directly, bypassing the need for the Preloader to initiate the handshake. This allows for the flashing of a new Preloader binary (.bin file) directly to the NAND/eMMC partition. Or for full flash: 
  python mtk
A user tried updating a Tecno Camon 18 via OTA. The phone shut off and never woke up. The PC showed an "MTK Preloader" device that disconnected every 3 seconds. Using the MTK Preloader Repair Tool, they bypassed the corrupted boot and reflashed the Preloader in 4 minutes. The phone booted.