Cant write to rfid..

[ryanm101]

I've got https://www.ebay.co.uk/itm/311802277286?var=610677010841 now when i dismantle it has 2 chips:

24C02n (http://ww1.microchip.com/downloads/en/devicedoc/doc0180.pdf)

and a chip i cant as yet id. sycbp1003 1908 311031 (markings may not be 100% hard to see)

https://photos.app.goo.gl/HBnC7DkVqCsQKGhA9
https://photos.app.goo.gl/GsHNETHe8DWsTs979

According to the seller it is supposed to be able to read and write.

PCB is marked R20D-USB ksz v1.4

This does appear as an input device on linux wondering if we can also write with it

Bus 003 Device 006: ID ffff:0035 Sycreader RFID Technology Co., Ltd SYC ID&IC USB Reader
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0xffff 
  idProduct          0x0035 
  bcdDevice            1.00
  iManufacturer           1 Sycreader RFID Technology Co., Ltd
  iProduct                2 SYC ID&IC USB Reader
  iSerial                 3 08FF20140315
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0034
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              4 USB Standard Keyboard
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      65
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 
      bInterfaceProtocol      0 
      iInterface              5 USB Vender Hid
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      35
          Report Descriptor: (length is 35)
            Item(Global): Usage Page, data= [ 0xa0 0xff ] 65440
                            (null)
            Item(Local ): Usage, data= [ 0x01 ] 1
                            (null)
            Item(Main  ): Collection, data= [ 0x01 ] 1
                            Application
            Item(Global): Report ID, data= [ 0x01 ] 1
            Item(Local ): Usage, data= [ 0x08 ] 8
                            (null)
            Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
            Item(Global): Logical Minimum, data= [ 0x00 ] 0
            Item(Global): Report Size, data= [ 0x08 ] 8
            Item(Global): Report Count, data= [ 0xff ] 255
            Item(Main  ): Feature, data= [ 0x02 ] 2
                            Data Variable Absolute No_Wrap Linear
                            Preferred_State No_Null_Position Non_Volatile Bitfield
            Item(Global): Report ID, data= [ 0x02 ] 2
            Item(Local ): Usage, data= [ 0x08 ] 8
                            (null)
            Item(Main  ): Feature, data= [ 0x02 ] 2
                            Data Variable Absolute No_Wrap Linear
                            Preferred_State No_Null_Position Non_Volatile Bitfield
            Item(Global): Report ID, data= [ 0x03 ] 3
            Item(Local ): Usage, data= [ 0x08 ] 8
                            (null)
            Item(Main  ): Feature, data= [ 0x02 ] 2
                            Data Variable Absolute No_Wrap Linear
                            Preferred_State No_Null_Position Non_Volatile Bitfield
            Item(Main  ): End Collection, data=none
can't get debug descriptor: Resource temporarily unavailable
cannot read device status, Resource temporarily unavailable (11)

[merbanan]

The seller is wrong, the device can not write. Try asking for software for writing.

[charlysan]

Hi @ryanm101,

I agree with @merbanan. This looks like a reader with no writing capabilities. Have you tried IDRW V3 or similar software under a VM? Not sure if this could help, but you can also try to sniff USB traffic to see if you can get any clue. Also, check for available commands.

Cheers