@W-rabbit I think you’re really found a bug, and it’s nasty one.
I can repo what you’re experiencing 100%
What I found so far that for cards and tags it works every time, for implants, as you said first time after connecting the device(wtf). Reproducible with both NeXT and xMagic. Let me know if they responded to you on Discord. I will do some more experiments tomorrow with the hf high range antennas and I will report again.
btw my implant positioning is right, I see how the voltage drops to
[usb] pm3 --> hf tune
[=] Measuring HF antenna, click pm3 button or press Enter to exit
[=] 40102 mV / 40 V / 43 Vmax
Also implants are discoverable from flipper and android phone so.
Here is some more info
[usb] pm3 --> hw status
[#] Memory
[#] BigBuf_size............. 40788
[#] Available memory........ 36944
[#] Tracing
[#] tracing ................ 0
[#] traceLen ............... 78
[#] Current FPGA image
[#] mode.................... HF image 2s30vq100 2023-05-26 19:50:53
[#] Flash memory
[#] Baudrate................ 24 MHz
[#] Init.................... OK
[#] Memory size............. 2 mbits / 256 kb
[#] Unique ID (be).......... 0x25999F97307C69D5
[#] Smart card module (ISO 7816)
[#] version................. v4.13
[#] LF Sampling config
[#] [q] divisor............. 95 ( 125.00 kHz )
[#] [b] bits per sample..... 8
[#] [d] decimation.......... 1
[#] [a] averaging........... yes
[#] [t] trigger threshold... 0
[#] [s] samples to skip..... 0
[#]
[#] LF T55XX config
[#] [r] [a] [b] [c] [d] [e] [f] [g]
[#] mode |start|write|write|write| read|write|write
[#] | gap | gap | 0 | 1 | gap | 2 | 3
[#] ---------------------------+-----+-----+-----+-----+-----+-----+------
[#] fixed bit length (default) | 29 | 17 | 15 | 47 | 15 | N/A | N/A |
[#] long leading reference | 29 | 17 | 18 | 50 | 15 | N/A | N/A |
[#] leading zero | 29 | 17 | 18 | 40 | 15 | N/A | N/A |
[#] 1 of 4 coding reference | 29 | 17 | 15 | 31 | 15 | 47 | 63 |
[#]
[#] HF 14a config
[#] [a] Anticol override.... std ( follow standard )
[#] [b] BCC override........ std ( follow standard )
[#] [2] CL2 override........ std ( follow standard )
[#] [3] CL3 override........ std ( follow standard )
[#] [r] RATS override....... std ( follow standard )
[#] Transfer Speed
[#] Sending packets to client...
[#] Time elapsed................... 500ms
[#] Bytes transferred.............. 243712
[#] Transfer Speed PM3 -> Client... 487424 bytes/s
[#] Various
[#] Max stack usage......... 4088 / 8480 bytes
[#] Debug log level......... 1 ( error )
[#] ToSendMax............... 1
[#] ToSend BUFFERSIZE....... 2308
[#] Slow clock.............. 31105 Hz
[#] Installed StandAlone Mode
[#] LF HID26 standalone - aka SamyRun (Samy Kamkar)
[#] Flash memory dictionary loaded
[#] Mifare.................. 1508 / 2047 keys
[#] T55x7................... 122 / 1023 keys
[#] iClass.................. 28 / 511 keys
[#]