MediaTek: BROM, PreLoader, Auth, Scatter and NVRAM
On MediaTek most problems come from PreLoader or BROM mode, authorization and firmware files. This page collects guides that explain the terminology and help you troubleshoot typical errors.
Core concepts
If the abbreviations are new, start with PreLoader vs BROM, then read about DA, SLA and Auth File and Auth Bypass.
Where to start
- Identify the chip line: Dimensity chips and connection mode.
- Install the driver: MediaTek VCOM on Windows 10/11.
- Learn the files: the scatter file and NVRAM.
Errors
S_BROM_CMD_STARTCMD_FAIL (2005) has its own breakdown. If SP Flash Tool asks for authorization, open the authorization error guide. For the big picture see the drivers and modes overview.
All guides in this topic
Drivers and connection modes: EDL, BROM, preloader and fastboot
A clear guide to phone connection modes (EDL/9008, BROM, preloader, Download Mode, fastboot) and the drivers each one needs for reliable detection.
November 4, 2026 · 4 min readDriversBROM error 2005 (S_BROM_CMD_STARTCMD_FAIL) on MediaTek: why and what to do
Error 2005 S_BROM_CMD_STARTCMD_FAIL on MediaTek: protected BROM, driver, connection order, DA and Auth files, and which tool to use instead of SP Flash Tool.
November 4, 2026 · 4 min readDriversMediaTek VCOM driver on Windows 10 and 11: install, check the port, fix errors
Install the MediaTek (MTK VCOM, BROM, PreLoader) driver on Windows 10 and 11: signature enforcement, port check, common errors and fixes.
November 4, 2026 · 4 min readDriversMediaTek Dimensity chipsets: identification, connection mode and protection
Dimensity 6080, 6100+, 7200, 8200 and more: identify the chip, pick the mode (BROM/PreLoader), the driver and the protection details for service work.
November 4, 2026 · 4 min readDriversPreLoader vs BROM on MediaTek: difference, ports and entering the right mode
How PreLoader differs from BROM on MediaTek, which port each uses, why entering BROM matters and how to do it, for flashing and FRP.
November 4, 2026 · 4 min readDriversDA, SLA and Auth File on MediaTek: what they are and how to clear the error
DA download fail, SLA, STATUS_SEC_AUTH_FILE_NEEDED on MediaTek: what the Download Agent, SLA/DAA and Auth File are, and why SP Flash Tool will not connect.
November 4, 2026 · 5 min readMediaTekMediaTek auth bypass: what it is and how authorization works
What MediaTek auth bypass means, why modern chips require DA and SLA authorization, and how it fits legitimate service work.
November 4, 2026 · 5 min readMediaTekSP Flash Tool authorization error on MediaTek: causes and next steps
Why SP Flash Tool shows an authorization error on MediaTek, how it relates to DAA and SLA, and when to switch to a service tool.
November 4, 2026 · 4 min readMediaTekMediaTek scatter file: what it is and how not to get it wrong
What a MediaTek scatter file is, why SP Flash Tool needs it, why the wrong scatter fails, and how not to mix firmware packs.
November 4, 2026 · 4 min readMediaTekMediaTek NVRAM: errors, backup and lawful restore
MediaTek NVRAM errors: why calibrations and IMEI vanish, how NVRAM differs from EFS talk, and how to restore lawfully from this device backup.
November 4, 2026 · 4 min readOther topics
Drivers & modes · Android Multi Tool · UnlockTool · Xiaomi · Samsung · FRP · Flashing & IMEI · Software rental · TSM & TFM
FAQ
What is BROM on MediaTek?
BROM is the boot ROM built into the chip. It lets you work with a device even when the firmware is damaged, and it differs from PreLoader.
Why do I need a scatter file?
A scatter file describes the partition layout. Without it SP Flash Tool does not know what to write where.
What should I do about error 2005?
Check the MTK VCOM driver, the cable and the connection mode. The breakdown linked above has the details.
Not sure which tool fits your model? Ask a technician on Telegram.