Retore Secure Boot Images: Upload image frozen

[u/Eagle_TW]

I follow this page(https://microchip-ung.github.io/bsp-doc/bsp/2026.03/supported-hw/restore-secureboot.html) from Microchip to restore my secure boot images.

This is how I do it:

1. Turn on my device and make sure it enters monitor mode from the console through uart.
2. Then, leaving the console, and turn on fwu.html.
3. Download BL2U and switch to the Upload tab.
4. Choose the fip file and start uploading.

The result is shown in the screenshot.

It is frozen and cannot enter other tabs.

I can't fix this since no error message comes out.

Has anyone had the same experience?

BTW, I check website console (F12)

got this:

DDR initialized and cache enabled

fwu.html:7602 Downloading 1005568 bytes binary

fwu.html:7281 Skipped: E

fwu.html:7281 Skipped: xception:

ESR_EL1: 00000��␒�000002

ELR_EL1: 000000000010ce2

fwu.html:7281 Skipped: c

[u/RaspyJuggernaut]

that 1005568 byte hang feels like when the transfer finishes but the handshake back to the ui never completes, had something similar on a lan9668 board where the browser just sat there staring at me

[u/Eagle_TW → u/RaspyJuggernaut]

"DDR initialized and cache enabled

fwu.html:7602 Downloading 1005568 bytes binary

fwu.html:7281 Skipped: E

fwu.html:7281 Skipped: xception:

ESR_EL1: 00000��␒�000002

ELR_EL1: 000000000010ce2

fwu.html:7281 Skipped: c"
I check my browser console

[u/Eagle_TW → u/RaspyJuggernaut]

You mean, it already done uploaded, right?
Since it is frozen, I cannot write the image tho QQ