Proxmark3 community

jramb0

Contributor

Registered: 2016-11-07

Posts: 25

iclass wrbl - writing failed

Hi All,

I am able to read the fobs using hf iclass rdbl b XX k XXXXXXXXXXX

However, I am having issues to write back the data to the blank fob when using the command:

hf iclass wrbl b 06 d XXXXXXXXXXXXX k XXXXXXXXXXXXXX

I get the error:
[-] Writing failed

I am not too sure if I am missing something.

When dumping the fob data, I can see all the blocks data (I have compared them to what I get through iclassified and confirmed they are OK)

I am just unable to write it back to the blank fob and it is getting to my head!

[ Proxmark3 RFID instrument ]

[ CLIENT ]
  client: RRG/Iceman/master/v4.9237-856-gd6e3366c 2020-08-26 21:28:50
  compiled with MinGW-w64 10.2.0 OS:Windows (64b) ARCH:x86_64

[ PROXMARK3 ]

[ ARM ]
  bootrom: RRG/Iceman/master/v4.9237-856-gd6e3366c 2020-08-26 21:28:35
       os: RRG/Iceman/master/v4.9237-856-gd6e3366c 2020-08-26 21:28:42
  compiled with GCC 9.2.1 20191025 (release) [ARM/arm-9-branch revision 277599]

[ FPGA ]
  LF image built for 2s30vq100 on 2020-07-08 at 23: 8: 7
  HF image built for 2s30vq100 on 2020-07-08 at 23: 8:19
  HF FeliCa image built for 2s30vq100 on 2020-07-08 at 23: 8:30

[ Hardware ]
  --= uC: AT91SAM7S256 Rev B
  --= Embedded Processor: ARM7TDMI
  --= Nonvolatile Program Memory Size: 256K bytes, Used: 255808 bytes (98%) Free: 6336 bytes ( 2%)
  --= Second Nonvolatile Program Memory Size: None
  --= Internal SRAM Size: 64K bytes
  --= Architecture Identifier: AT91SAM7Sxx Series
  --= Nonvolatile Program Memory Type: Embedded Flash Memory

It would be great if someone would put me on the right track of what I am doing wrong or help a bit!

Thanks!

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: iclass wrbl - writing failed

are you sure you have the right key?

jramb0

Contributor

Registered: 2016-11-07

Posts: 25

Re: iclass wrbl - writing failed

wouldn't be the same key as the one to read the fob?

iceman

Administrator

Registered: 2013-04-25

Posts: 9,538

Website

Re: iclass wrbl - writing failed

depends on configuration of the card...
I have no issue writing to a iCLASS card with legacy key or an elite key,  so I can't replicate your problem.

hayabusa

Contributor

From: Australia

Registered: 2019-08-27

Posts: 12

Re: iclass wrbl - writing failed

Hi iceman,

I believe it is the same issue as previous one
refer to "iClass Write block [XX] failed"
Cheers