Agilex 5 premium board - es version - boots with gibberish prompts

Hello dear community,

I am trying to boot linux on the Altera Agilex 5 premium board - es version with the
pre-built binaries. I followed the documentation still getting prompts in gibberish.
Following is a detailed description of the procedure I used.

My questions:
1. What am I doing wrong?
2. What should be my debugging flow steps?

Detailed description of the procedure to demonstrate the issue:
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In order to verify the Agilex 5 SoC premium baord is booting correctly, I used the
pre-build binaries per the following instructions of this link:

https://altera-fpga.github.io/rel-25.1.1/embedded-designs/agilex-5/e-series/premium/gsrd/ug-gsrd-
agx5e-premium/#configure-serial-console

I followed the paragraphs starting with the title "

Exercising Prebuilt Binaries"

This page instructs the user to download the pre-built binaries from this release:
https://releases.rocketboards.org/2025.08/gsrd/agilex5_dk_a5e065bb32aes1_gsrd/

I followed the instructions of "Booting from SD card".

The workstation is Windows 10 machine and the Terminal application is putty.

Eventually, when booting the linux per these instruction, I see the first stage boot loader (u-boot spl)

is prompting correct font, however the next booting stages are prompting gibberish.
Attached is a screenshot (202604262215screenshot.jpg).