xEM acting strange, unable to write


#1

Hi,

I got the xEM installed a week ago. I wanted to clone an access card to it, but it does not respond to write commands. I am using proxmark3 and I am convinced I get strong signal. Can anyone please help me fix it or at least debug? Thanks. Here are some outputs from proxmark3:

proxmark3> lf t55 detect
Chip Type  : T55x7
Modulation : BIPHASEa - (CDP)
Bit Rate  : 5 - RF/64
Inverted  : Yes
Offset    : 57
Seq. Term. : No
Block0    : 0xE01780BE

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | E01780BE | 11100000000101111000000010111110
  1 | E01780BE | 11100000000101111000000010111110
  2 | E01780BE | 11100000000101111000000010111110
  3 | C02F017C | 11000000001011110000000101111100
  4 | E01780BE | 11100000000101111000000010111110
  5 | C02F017C | 11000000001011110000000101111100
  6 | AE01780B | 10101110000000010111100000001011
  7 | C02F017C | 11000000001011110000000101111100
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | E01780BE | 11100000000101111000000010111110
  1 | C02F017C | 11000000001011110000000101111100
  2 | C02F017C | 11000000001011110000000101111100
  3 | C02F017C | 11000000001011110000000101111100
proxmark3> lf t55xx trace
The modulation is most likely wrong since the ACL is not 0xE0.
proxmark3> lf search
NOTE: some demods output possible binary
  if it finds something that looks like a tag
False Positives ARE possible


Checking for known tags:

EM410x pattern found:

EM TAG ID      : 2015060494

Possible de-scramble patterns
Unique TAG ID  : 04A8602029
HoneyWell IdentKey {
DEZ 8          : 00394388
DEZ 10        : 0352715924
DEZ 5.5        : 05382.01172
DEZ 3.5A      : 032.01172
DEZ 3.5B      : 021.01172
DEZ 3.5C      : 006.01172
DEZ 14/IK2    : 00137791669396
DEZ 15/IK3    : 000020004741161
DEZ 20/ZK      : 00041008060002000209
}
Other          : 01172_006_00394388
Pattern Paxton : 538591892 [0x201A4294]
Pattern 1      : 589853 [0x9001D]
Pattern Sebury : 1172 6 394388  [0x494 0x6 0x60494]

Valid EM410x ID Found!

Xem came with a password