Unbrick via SP Flash Tool V6

Download UsbDK (<a href='https://t.me/rn14docs/22' target='_blank' rel='noopener' class='underline text-amber-200 hover:text-white'>t.me/rn14docs/22</a>) and LibUsb (<a href='https://t.me/rn14docs/21' target='_blank' rel='noopener' class='underline text-amber-200 hover:text-white'>t.me/rn14docs/21</a>). Install both, must reboot Windows/PC afterwards. Disable Windows Defender/antivirus beforehand. If using preloader_eng see #antibrick_patch notes.

Download SP Flash Tool V6 (<a href='https://t.me/rn14docs/23' target='_blank' rel='noopener' class='underline text-amber-200 hover:text-white'>t.me/rn14docs/23</a>) and any region stock fastboot ROM (tgz). Extract both into the same folder to keep paths clean.

Run SP Flash Tool as Administrator on Windows. Look for the Download-XML tab/menu at the top.

Click Browse in Download-XML field and select flash.xml inside ROM folder: usually at images/download_agent/flash.xml. Ensure path loads without error.

Below there is Authentication File field. Click Browse and select auth_sv5.auth at ROM root folder. Usually located at auth_sv5.auth

In dropdown below Authentication File keep Download Only - never choose Format All or Firmware Upgrade as it will re-lock bootloader. Recommended to uncheck preloader to keep current preloader_eng for easier future unbrick.

Hit Download in SP Flash Tool, then connect dead phone to PC/laptop via USB. Wait until 100% complete (green bar). After finish phone won’t auto power on - turn on manually by holding Power. If fails try different USB 2.0 port.