BBFLY produces ELM27 clones and is probably the best of the So Called ELM327 clones, all of which FORScan no longer recommends!
The FTDI 232RL chip spec Is referring to the Serial UART converter to USB chip and has nothing to do with the STN number! It is this chip that you download the drivers for to make the adapter connect to the computer!
The STN number(STN 1110 up to 2120) refers to the Hardware Chip and instruction set of the interface chip that communicates between the vehicles DLC connector and the above FTDI232(or by its original generic spec called RS232) serial converter to USB interface! It is this DLC to FTDI232 interface chip that later adapters(STN1170 and up chips) with up-gradable firmware are actually updating with the Firmware updates!
According to the specs I have been able to find the BF320302 is the older PIC 18 type interface chip(MicroChip PIC chips can use the STN Instruction And/or ELM327 instuction set) which means it is probably a clone of the STN 1130- 1170 or an ELM327 V1.4 chip! You would have to take it apart and look at the chip markings under a Magnifying glass to be sure! Also FORScan Will report what Instruction set it sees under the Configuration Tab during connection, in the Car Icon(STN11XX or ELM327vx.x)!
I have an old OBDLINK Scantool.net SX adapter that uses a PIC 24 chip and reports itself as STN 1130(Before I destroyed it attempting to modify it for the HS/MSCAN RS232 Relay) and I also have an ELMSCAN 5(I successfully Modified this one with the HS/MSCan toggle switch) that was also produced by Scan tool.net that has a PIC 18 Chip and reports itself as ELM327 v1.4! Neither of these adapters are/were firmware up-gradable!
More Info Here
https://www.obdsol.com/solutions/chips/!
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