topic Re: Cannot flash a PN7642 with Host Interface (I2C) in NFC

Cannot flash a PN7642 with Host Interface (I2C)

V_Palacio — Tue, 16 Jun 2026 06:19:29 GMT

Hello,

I'm trying to flash a customized FW in a PN7642 via I2c with the LPC55S16 companion board.

I've generated the esfwu file with Host Crypto Scripts (01.03), using as Transport Key the one for C101 chip (We have reworked our EVK board to solder a new C101 chip)

Custom (not secure) update fails with error 0x01.

If I flash the NXP FW (secure), version 03.00, works OK.

I suspect the HostScript configuration file is not OK for a customer FW.

I only modified it to change the aes_key from C100 transport key to C101 transport key.

Can I get some help?

Regards,

Re: Cannot flash a PN7642 with Host Interface (I2C)

KaiLi — Fri, 19 Jun 2026 14:13:35 GMT

Hello @V_Palacio

For C101, you should select the project:

For updating customized FW, you should put your customized FW in the correct path and select "6".

Re: Cannot flash a PN7642 with Host Interface (I2C)

KaiLi — Fri, 19 Jun 2026 14:23:30 GMT

Hello @V_Palacio

Or could you share your FW file with us and let me try it on my site?

Re: Cannot flash a PN7642 with Host Interface (I2C)

V_Palacio — Mon, 22 Jun 2026 05:51:56 GMT

HI,

Find attached my FW file. Is generated as esfwu, but renamed so I can attach it here.

Also attached my toml file and the original .bin FW.

Let me know if works in your side.

Regards,

Re: Cannot flash a PN7642 with Host Interface (I2C)

V_Palacio — Mon, 22 Jun 2026 05:54:01 GMT

Hi @KaiLi ,

I assume this is not the problem, because it connects ok, and I had no problem updating the NXP secure firmware with the LPC via I2C.

Regards,