TRE27 (STN1170/ELM) Adapter does not generate CF frames

[MayTheFordBeWithYou]

I need some help please. My STN1170 (TRE27 adapter) does not generate CF (30 00 00) frames and i could not get why?

I send

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ATZ
AT SH 726
AT SP 6
22 F1 90

and get only the first-frame in return

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>22 F1 90
01B
0: 62 F1 90 57 46 30

After attaching an CAN-Sniffer in read-only mode to the same bus i see that it does not generate the necessary flow-control frame, it just stops after receiving the FF:

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52,974 726      8 03 22 F1 90 00 00 00 00
52,986 72E      8 10 1B 62 F1 90 57 46 30

[MayTheFordBeWithYou]

It was a problem because of the cheap clones. I've bought an genuine STN22xx adapter (OBDLinkEX) and with it, all works fine and as expected.