Hi alacran,
I didn't modify the BIOS. Secure boot was already disabled before the motherboard issue.
Before the first failed attempt, no body touched the BIOS settings.
I don't think that the repair facility changes any settings, simply they changed the mother board.
UEFI grub4dos loads the .iso file without any problem. I am not omitting the status of secure boot ( disabled )
It's always on my mind.
Something interesting, before the motherboard failed, the boot menu was presented as GUI display, blue screen with white text.
After the repair, the boot menu appears as console window text, white characters on black screen.
Sorry to disagree with you, but:
HP very clearly says this model is freely updatable to Win11. In order to let OEMs say certain product is Win 11 updatable they have to comply with certain rules, one of them is their products have Secure Boot enabled and also that the PC has the TPM: Trusted Platform Module (TPM) version 2.0 already installed into the MB.
Previously (when failed) it was booting in the usual GUI mode, now it is booting in text mode (boot menu policy = legacy), please see attached picture, this change is made editing the BCD, this means the settings are not exactly the same as when the MB failed, so they were changed very possibly on the certified maintenance shop, including disable SB, and it also seems to me it is highly probable in first failed intent, SB was enabled (as it is usual), and you just involuntarily forgot to check it, and you are assuming you verified it.
I didn't mean you intentionally omitted in your previous post SB is currently disabled, I only mean you did not make any comment about its current status.
Changing the boot menu to legacy (boot menu policy = legacy), has an aditional advantage, it allows to boot directly to the option selected by the user, in GUI mode to boot anything different to the default Win OS installed, the PC is forced to make an extra new reboot and then it finaly boots from that option.
But anyway I'm glad it is working fine now the way you want/need.
alacran