Proxmark3 community

fgo

Contributor

Registered: 2013-04-22

Posts: 14

cannot write on a mifare (noob)

Hello all,
I just received my proxmark3, and playing around with it on a mifare 1k, I found the keys from the card, then I wrote on it
Unfortunately I can't write again on it after having wrote once on it
here's what I have done:
hf mf nested:=>
Iterations count: 2
|---|----------------|---|----------------|---|
|sec|key A           |res|key B           |res|
|---|----------------|---|----------------|---|
|000|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|001|  000000000000  | 1 |  000000000000  | 1 |
|002|  a0a1a2a3a4a5  | 1 |  85054dd6f02f  | 1 |
|003|  a0a1a2a3a4a5  | 1 |  43c89291735b  | 1 |
|004|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|005|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|006|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|007|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|008|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|009|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|010|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|011|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|012|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|013|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|014|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|015|  a0a1a2a3a4a5  | 1 |  b0b1b2b3b4b5  | 1 |
|---|----------------|---|----------------|---|

then I write a block
hf mf wrbl 7 b 000000000000 0000000000ffffff000000000000
=>
--block no:07 key type:01 key:00 00 00 00 00 00
--data: 00 00 00 00 00 00 ff ff ff ff 00 00 00 00 00 00
#db# WRITE BLOCK FINISHED       
isOk:01
hf mf wrbl 7 b 000000000000 0000000000ffffff95c04f3f9ff0

Then I tried to change the right tail of the block (to change the b key)
wrbl
--block no:07 key type:01 key:00 00 00 00 00 00
--data: 00 00 00 00 00 00 ff ff ff ff 95 c0 4f 3f 9f f0
#db# Cmd Error: 04       
#db# Write block error       
#db# WRITE BLOCK FINISHED   

It doesn't work anymore!

How should I do it to make it write again?

Many thanks for your answers!
Francois

kra

Contributor

Registered: 2011-01-19

Posts: 59

Re: cannot write on a mifare (noob)

if you want to write que block 7

hf mf wrbl 7 b b0b1b2b3b4b5 0000000000ffffff95c04f3f9ff0

Because if you look the nested result the key for the block 7 is b0b1b2b3b4b5.

You are putting the key for the 2cond block this is the why is not working