SSCOM 3.2 can send binary files (BIN, HEX, firmware images) over serial at high baud rates with YMODEM-style flow control options. While not as robust as dedicated bootloader tools, it works surprisingly well for uploading simple firmware updates.
Most users only scratch the surface. Here are the power-user capabilities: sscom 3.2
Unlike Putty, which displays a continuous stream of incoming bytes, SSCOM 3.2 can automatically insert line breaks based on timeouts. You can configure it to treat a 10ms idle period as the end of a packet. This is invaluable when debugging Modbus RTU or proprietary binary protocols where framing is critical. SSCOM 3
Cause: The port is already open by another application (Arduino IDE, CuteCom, another SSCOM instance). Solution: Close all other serial monitoring software. If unsure, reboot the PC. Most users only scratch the surface
SSCOM 3.2 is widely available on embedded forums, GitHub, and Chinese tech sites like amobbs.com (original source). Always scan for malware. Alternative modern clones include sscom5 (with GUI improvements).