NFC emulation error: mfoc says "tag disappeared", cant read emaulated tag

kuai6 · October 30, 2022, 4:29pm

Hi there.

I just got my flipper and first thing i did - tried to clone and emulate NFC Mifare Classic 1k tag.
The tag was readed successfully, but i faced with issues when i try to emulate the tag - other devices can’t read the emulated tag.

I tried to check with my acr122u reader with mfoc tool and got error

sudo mfoc -O flipper/acr122u_emulated_result.mfd
Error: tag disappeared

My phone with NFC also can’t read emulated tag.

Also I’ve tested other tags i have - the same issues with them.

FW version 0.69.1

Is there a bug or i just have screw hands?

kuai6 · October 30, 2022, 4:47pm

Found the same issue here it seems to be software problem.

github.com/flipperdevices/flipperzero-firmware

NFC Miflare Classic 1K full emulation not working?

opened 02:15PM - 10 Oct 22 UTC

netdoggy

NFC bug

### Describe the bug. Please tell me, should Miflare Classic 1K be emulated w…ith a flipper completely or only UID? If I take the saved Miflare Classic 1K file (from the intercom), together with the keys in the sectors, and click emulate, my android does not react to it in any way. At the same time, it perfectly reads the original chip. The intercom is also not working by Flipper but it is trying to read sector 0 with the key. Upd: It seems that according to the documentation MIFARE Classic 1K and 4K has full support. I tried running the emulation via NFC->Add Manually -> Mifare Classic 1-4k* and none of the "Mifacre classic" emulation seems to work with scanning from an android phone, but some others seem to work like Mf Ultralight. I thought maybe this is a hardware problem, but it looks like it's still software? ### Reproduction NFC->Add Manually -> Mifare Classic 1-4k* and check by android mobile phone ### Target dev-3fd30a91 ### Logs _No response_ ### Anything else? _No response_