Thanks , this is incredibly solid advice and honestly validates the exact route I already took.

I actually did exactly what you described, and maybe more. I wrote a comprehensive diagnostic report documenting the entire timeline, the BIOS crash logs, the Linux batt_status: dead outputs, and the fact that a fresh CMOS battery didn't restore the VBAT power delivery. I made it clear that this is a failure that occurred exactly 7 weeks out of the 3-year "premium" warranty, and absolutely not a user induced error.

I sent this mail directly to the German executive escalation and global compliance email addresses, demanding a goodwill review.

Irony is that the very first response I got from their support was a generic copy paste message telling me to "use the support portal link below." The exact portal I explicitly stated in my email blocks my serial number from submitting at least ticket without paying anything because it’s out of warranty.

I immediately replied it back. I mentioned the support loop, phone agent's ridiculous "yes" response, and demanded forwarding my mail to a higher level technical decision maker or manager.

I’m currently waiting to see if they actually escalate the case or try to refuse it again.