Fix Mifare Classic Gen2

BCC0 incorrect, got 0x04, expected 0x00

hf 14a config --bcc ignore
hf mf wrbl --force --blk 0 -k FFFFFFFFFFFF -d 010203040408040000004A495256494E
hf 14a config --bcc std

Card didn't answer to CL2 select all

hf 14a config --cl2 skip
hf mf cload -f hf-mf-5A66EFC4-dump-1.eml
hf 14a config --cl2 std

Card doesn't support standard iso14443-3 anticollision

hf 14a config --atqa force --bcc ignore --cl2 skip --cl3 skip --rats skip
hf mf wrbl --force --blk 0 -k FFFFFFFFFFFF -d 010203040408040000004A495256494E
hf 14a config --atqa std --bcc std --cl2 std --cl3 std --rats std

Explanation

Yes it is possible to fix this issue on a Gen2. Only difference being is that you have to rewrite all of B0 using the normal write command hf mf wrbl

The only limiting factor which can prevent fixing this issue on a Gen2 would be if the sector bits (control write/read access to sector) are set in a way that restrict modifying S0.

I’m also assuming you are having the same issue as above with a bad BCC0 only.

In order to understand the issue further and be able to try to get some data from the card, we can disable anti-collision which is the feature that give this error.
Steps to disable anti-collision & write good B0 data (no backdoor commands)

    View current anti-collision configuration
    hf 14a config
    Disable BCC0 checking
    hf 14a config --bcc ignore
    Try to read card data
    hf 14a info
    2.1 If above command works, read S0 contents
    hf mf rdsc -s <Sector number> -k <key|12Hex> 2.1.1 Write good B0 to fix BCC0 issue hf mf wrbl --blk 0 -k <key|12Hex> -d <data|16hex>`
    Example data/good B0: 010203040408040000004A495256494E
    Reset anti-collision to defaults
    hf 14a config --bcc st

Please try the above and let me know how it goes.

# All configs 
hf 14a config --atqa skip
hf 14a config --bcc ignore
hf 14a config --cl2 skip
hf 14a config --cl3 skip
hf 14a config --rats skip

https://forum.dangerousthings.com/t/ok-so-im-having-trouble/11759/54?page=3

wupC1 error Can't set magic card block: 0

$ git clone https://github.com/RfidResearchGroup/proxmark3
$ mv Makefile.platform.sample Makefile.platform
$ make

Inside: Makefile.platform

PLATFORM=PM3GENERIC

==========================
Access Bits:
https://www.nxp.com/docs/en/data-sheet/MF1S50YYX_V1.pdf

# Clone Card
$ sudo miLazyCracker
$ sudo nfc-mfclassic w b new_data.mfd old_data.mfd
$ hf mf autopwn

# Clear card
$ hf mf cwipe
$ hf mf csetblk -b 0 -d 9A41577FF3980200E323002000000022

$ hf mf wipe -f hf-mf-7AA9E8C4-key-006.bin
$ hf mf wrbl --force --blk 0 -k FFFFFFFFFFFF -d 010203040408040000004A495256494E