If your device features Secure Boot Authorization (SLA) or Download Agent Authorization (DAA), it will block the RAM configuration outright. You must bypass this security check.
: Flashing a ROM that is not for your exact phone model or a different regional variant (e.g., flashing Global firmware on a Chinese model).
✅ Correct firmware for exact model ✅ Alternative Download Agent ✅ Latest SP Flash Tool version ✅ Good USB cable & port ✅ Fully charged battery ✅ Reinstalled MTK drivers ✅ Tried another PC
Note: This method only works if the phone's existing preloader matches the firmware partitions you are attempting to flash. 6. Rule out Hardware Damage sp flash tool error status ext ram exception
Driver issues are notorious on Windows 10 and 11.
The standard DA file lacks the correct External Memory Interface (EMI) configuration for your specific RAM vendor (e.g., Samsung, Micron, or SK Hynix). Firmware Mismatch:
The MediaTek VCOM or Preloader drivers on your PC are corrupted, outdated, or conflicting. If your device features Secure Boot Authorization (SLA)
If your preloader is wrong, using this mode can hard-brick your device. Stick to Firmware Upgrade or Download Only . 2. Update or Change the Download Agent (DA) File
Keep it open, then in SP Flash Tool, go to and set it to UART using the COM port provided by the bypass tool. Hardware Connection :
Once the tool says "Protection Disabled," close the bypass tool (keeping the phone connected) and immediately press in SP Flash Tool. 4. Reinstall MTK VCOM Drivers Cleanly ✅ Correct firmware for exact model ✅ Alternative
The "Ext RAM" error often occurs because Windows is assigning a generic driver instead of the specific MediaTeK Port Driver.
If you are using an Auth Bypass tool, the connection might be unstable in the default USB mode. Go to > Connection . Switch the connection from USB to UART .