Mt6877 Flash Tool -

You will see several options at the top of the tool. For most users, the safest choice is "Download Only" . Select "Firmware Upgrade" only if you have wiped your device or are upgrading Android versions. Avoid using the "Format All + Download" option, as this can delete your phone's unique IMEI numbers.

| Error | Fix | |-------|-----| | STATUS_SEC_AUTH_FILE_NEEDED | DA doesn’t match secured boot → use newer Auth Bypass tool. | | BROM ERROR: S_BROM_CMD_STARTCMD_FAIL | Driver issue → reinstall VCOM drivers / use USB 2.0 port. | | S_DL_PMT_ERR_NO_SPACE | Incorrect scatter partition layout → match exactly with firmware version. | | DA_HASH_MISMATCH | Download Agent is blacklisted → find unsigned DA for MT6877. | mt6877 flash tool

Wait for the process to complete. A green checkmark widget with a text banner will pop up. Disconnect the USB cable safely from your computer. You will see several options at the top of the tool

To help you get the exact files or steps for your specific device, could you tell me: What is the of your MT6877 phone? Avoid using the "Format All + Download" option,