: If you disconnect the device at any point, you must rerun the bypass utility before attempting another operation in SP Flash Tool.

SP Flash Tool Auth Bypass: The Ultimate Guide for All MediaTek (MTK) Devices

: Used to create a filter driver for the MediaTek port.

To help narrow down your troubleshooting steps, what is the exact of the device you are working on and the MediaTek chipset number it uses? Share public link

MediaTek devices only stay in BROM mode for a short window. You must click the "Bypass" button before plugging in the device so the script captures the port immediately. Supported MediaTek Chipsets

MediaTek chipsets contain a that controls the initial startup process. To prevent unauthorized flashing, many manufacturers (like Xiaomi, Realme, and Vivo) enforce Serial Link Authentication (SLA) and Download Agent Authentication (DAA) .

: While specific versions vary, common supported SoCs include MT6261, MT6580, MT6735, MT6737, MT6765, MT6771, MT6785, and even newer 5G Dimensity series like MT6873.

Since these tools are community-developed and often gray-area, they are typically found on developer forums (like XDA Developers), GSM hosting forums, or specific Telegram channels dedicated to MTK firmware. Always scan downloaded files for malware before running them on your main PC.

: Click Download . The progress bar should now move without an "Authentication File needed" error. Troubleshooting Tips

Set the to match the exact COM port number displayed in your Auth Bypass Tool (or check Windows Device Manager under Ports (COM & LPT) ).

: Hold the specified hardware buttons (usually Volume Up , though some devices use Volume Down or both) and connect it to the PC via USB.

Hold down both the and Volume Down buttons simultaneously.