Next if os_sprintf(temp,"%04X%06X\r\n", AT_VERSION,SDK_VERSION); is correct then the AT version is 0016 which has no meaningful correlation to the the name used for a bin file
Ex.for v0.9.2.2 AT Firmware.bin AT+GMR gives 0019000902 so 0019 is AT 9.2.2. Sure is intuitive.
Anyway at least someone thought of Versioning versus signs of the zodiac horoscope labeling.