NExT v2 NFC side doesn't wanna write [SOLVED]

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AAAAaaaaaye, it’s been a while.

Just put the newer NExT in my other (right) hand and the install went smooth. Haven’t bothered checking the LED (green) yet cause bandaid in the way, but I was checking RFID with flipper and was able to write to it with a few of the saved codes I have.

When I tried to write a website link to it with the NFCTool app though it always says ”write error” but it senses it fine each time and let’s me look at the memory. I tried writing FF:FF:FF:FF on block 0x04 under advanced commands but still had the write errors when went back to trying to put the link on it after.

Checked on the flipper zero and it says it has a couple of password protected pages and I was gonna try unlocking by manually putting in the DNGR password (in hex) I saw mentioned in another much older post, but it says that it’ll block the card if the password I put in is wrong.

Anyway to confirm the unlock password or another way to get it to start allowing writing?

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You don’t need the password to write to block 4. a2 04 ff ff ff ff should be the whole command.
a2 → write
04 → block to write to
Followed by four bytes of data.

Or you could just write an ndef record :blush:

Edit: missed the write error hrmmm… will investigate further Wednesday

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I had issues with my next v2 as well. It seemed it wasn’t formatted correctly. I had to use NFC tools to fix it with the help of @Equipter

Via equip.

Go to nfc tools main menu, other, advanced nfc commands.

Enter the below and send them one by one, tap your implant each time it prompts you to scan. You will see `>A0` as confirmation of success after each scan

```

A20400000000

A20500000000

A2060000031F

A207D1011B55

A20803666F72

A209756D2E64

A20A616E6765

A20B726F7573

A20C7468696E

A20D67732E63

A20E6F6D2FFE

```

Doing this fixed it so I can write to it chips again. No idea why I had the errors.

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AAAAYEE! It was the same fix!!! Nice, thanks for sharing the knowledge. we in business now

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Thanks Ham. This fixed my writing issue.

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Thank @Equipter it’s a direct copy paste from his help

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Hello, after using this fix for next v2, I can write to the chip, even format it and write content using NXP Tag Writer and NFC Tools, but I can only do this with Samsung A series phones. Nothing else can read the chip, I have unsuccessfully tried Galaxy S10, various iPhones, Flipper Zero, Proxmark 3 RDV 4 (magnetic coupling is visible, but no card identified).

Can you please advise me how to diagnose and ideally fix the situation?

Is there a way to verify the fix is applied fully? All the commands were confirmed, but the process is kinda sketchy. Thanks for any tips.

Memory DUMP attached, can you help me check it?

bluetooth_content_share.txt (7.5 KB)