How to solve VVDI MINI Key Tool can not read 868mhz frequency

Xhorse VVDI MINI Key Tool can read frequency, and shows result on the little screen, but no frequency on vvdi mini. What’s a problem?

VVDI2 test OK

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But VVDI MINI can not

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Engineer suggestion:

If you are testing the 868mhz, you have to change the option on the APP to test. The signal of the 868 is weak and difficult to test.