STATUS_EXT_RAM_EXCEPTION (error code 0xC0050005) is a critical communication failure in the SP Flash Tool. It indicates that the Download Agent (DA)
Sometimes the preloader itself is the problem. Force the device into BROM mode (a lower-level mode that bypasses corrupted preloader): sp flash tool error status ext ram exception
Once bypassed, ensure SP Flash Tool is set to Connection > UART with the correct COM port identified by the bypass tool. Reballing the RAM chip