https://community.nxp.com/t5/NFC/Cannot-flash-a-PN7642-with-Host-Interface-I2C/m-p/2381618#M14301 <P>Hello,</P><P>I'm trying to flash a customized FW in a PN7642 via I2c with the LPC55S16 companion board.</P><P>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)</P><P><LI-MESSAGE title="Step by Step Guide to update user firmware through host interface for PN7642" uid="1966465" url="https://community.nxp.com/t5/NFC-Knowledge-Base/Step-by-Step-Guide-to-update-user-firmware-through-host/m-p/1966465#U1966465" discussion_style_icon_css="lia-mention-container-editor-message lia-img-icon-tkb-thread lia-fa-icon lia-fa-tkb lia-fa-thread lia-fa"></LI-MESSAGE>&nbsp;</P><P>Custom (not secure) update fails with error 0x01.&nbsp;</P><P>If I flash the NXP FW (secure), version 03.00, works OK.</P><P>I suspect the HostScript configuration file is not OK for a customer FW.</P><P>I only modified it to change the aes_key from C100 transport key to C101 transport key.</P><P>Can I get some help?</P><P>Regards,</P><P><BR /><BR /></P> Tue, 16 Jun 2026 06:19:29 GMT V_Palacio 2026-06-16T06:19:29Z https://community.nxp.com/t5/NFC/Cannot-flash-a-PN7642-with-Host-Interface-I2C/m-p/2381618#M14301 <P>Hello,</P><P>I'm trying to flash a customized FW in a PN7642 via I2c with the LPC55S16 companion board.</P><P>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)</P><P><LI-MESSAGE title="Step by Step Guide to update user firmware through host interface for PN7642" uid="1966465" url="https://community.nxp.com/t5/NFC-Knowledge-Base/Step-by-Step-Guide-to-update-user-firmware-through-host/m-p/1966465#U1966465" discussion_style_icon_css="lia-mention-container-editor-message lia-img-icon-tkb-thread lia-fa-icon lia-fa-tkb lia-fa-thread lia-fa"></LI-MESSAGE>&nbsp;</P><P>Custom (not secure) update fails with error 0x01.&nbsp;</P><P>If I flash the NXP FW (secure), version 03.00, works OK.</P><P>I suspect the HostScript configuration file is not OK for a customer FW.</P><P>I only modified it to change the aes_key from C100 transport key to C101 transport key.</P><P>Can I get some help?</P><P>Regards,</P><P><BR /><BR /></P> Tue, 16 Jun 2026 06:19:29 GMT https://community.nxp.com/t5/NFC/Cannot-flash-a-PN7642-with-Host-Interface-I2C/m-p/2381618#M14301 V_Palacio 2026-06-16T06:19:29Z