yg-6m021.bin
To understand the file, you must understand its hardware environment. yg-6m021.bin is almost always found on ARM Cortex-M series or XTensa LX106 (ESP8266-like) architectures, though some variants indicate a 8051 core. Typical hardware includes: yg-6m021.bin
In all these cases, the file is stored on an external SPI flash chip (usually 2MB or 4MB Winbond or XMC) and mapped into memory at boot. yg-6m021
binwalk yg-6m021.bin
strings yg-6m021.bin | head -20
hexdump -C yg-6m021.bin | less