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Time changes and with it the technology
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0.0.7 ? thats an old firmware.
Try compiling / flashing latest source from Github and use 1-2cm distance between antenna and tag. Finding the sweetspot is different on each HF protocol, like 14a, 14b. 15 , iclass. Where 14a needs 1-2cm, 14b/legic needs closer to antenna, 15 is upto 6cm, iclass 1-3cm..
Also try making a stronger antenna, to see if that helps. hf voltages above 20v is good.