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I have read at your wiki(http://wiki.radiowar.org/Proxmark3_Mod) that you modified:
1) Electrolytic capacitors to tantalum capacitors. Can you calculate a voltage difference between them using same antenna and hw tune command?
2) JTAG. Did you removed it completely? Or is it still on board? I can see 4 inputs.
3) Replacing the original IC. Did you replaced ARM with bigger one or what?