Unsolved
1 Rookie
•
7 Posts
0
41
October 10th, 2025 07:02
Pro Slim QCS1250, BIOS v1.8.2 Faulty, Crashing Win11
Replicated this issue 5x to confirm a faulty Bios release. After updating from v1.8.1 to the latest v1.8.2. The Computer with win11 will go on a bootloop. You will not be able to reinstall successfully either via bios osrecovery or windows 11iso. Cut the long story short after much poking around, it comes down to the security certificates that the new bios is deploying, which pretty much messes with the TPM. There is the potential for clients of losing their data if they do not have backups of their bitlocker keys. As it seems like the new bios messes with tpm data? I donno just my guess. It does say on the bios 1.8.2 info it updates security certificates! One way I discovered recovering from this without wasting time messing around downgrading bios and reinstalling os. Is to clear TPM and bypass ppi. I supposed only do this if you enabled bitlocker and have your keys. I went thru with a dell tech on my procedures and findings of which I lay out what I did to recover from this. Obviously there is this issue with the new bios that is 100% replicable on the Dell Pro Slim QCS1250. Please investigate and provide a fix. there is a danger to clients data.
IM247
1 Rookie
•
7 Posts
0
October 10th, 2025 07:10
Something else is amiss after doing a reboot after a day...back to a bootloop.
I think I will have to downgrade Bios to 1.8.1 route....until dell fixes this shemozzle
(edited)
user_0fe659
1 Rookie
•
1 Message
0
October 10th, 2025 11:21
Hi, thanks for raising this — and I completely understand the concern, especially with the risk to BitLocker and TPM-bound data.
It does appear that BIOS v1.8.2 on the Dell OptiPlex Pro Slim (QCS1250) is triggering a conflict with TPM/security certificates, which leads to the Win11 bootloop and failed recovery attempts. Your findings about TPM reset are in line with what others have reported.
What Affected Users Can Do Right Now:
Do not proceed with BIOS 1.8.2 if you're currently on 1.8.1 and stable.
If already updated and stuck in a bootloop:
Enter BIOS → Security → Clear TPM (only if BitLocker recovery key is backed up).
Bypass PPI, then reboot.
If system remains unstable, temporarily rollback to BIOS 1.8.1 using Dell BIOS Recovery from USB.
Why It’s Happening:
BIOS 1.8.2 includes updated security certificates, which appear to interfere with existing TPM provisioning — leading to a corruption or mismatch that Windows interprets as hardware tampering.
This behavior is fully reproducible and could put user data at risk. A revised BIOS or clarification on TPM migration handling in 1.8.2 would be highly appreciated to prevent BitLocker lockouts.
IM247
1 Rookie
•
7 Posts
0
October 14th, 2025 02:14
@user_0fe659
SO CRAZY DELL hasn't removed the v1.8.2 BIOS from updates and drivers/software support!! I am hearing from online support of the number people having the same issues!
(edited)