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September 8th, 2025 22:06
Issue with Precision 5560 BIOS
Hello,
I recently updated to a new BIOS v1.4 on my precision 5560 laptop. It seemed fine and booted normally the first time. A few days ago I tried to start my laptop and it got very hot and wouldn't boot into Windows.
I did an advanced diagnostics check with everything showing to be fine. I looked in BIOS and noticed RAID mode had been switched on. I tried switching back to ahci but the BIOS is not saving the setting and keeps switching back to RAID.
Clearly this is the issue, which started after the BIOS update. I managed to install the previous BIOS v1.38 successfully but the problem persists. I also realised there is no CMOS battery to replace and already tried unplugging the battery, switching RAM and SSD before going about trying to downgrade the BIOS so I'm a bit stuck. Any help with resolving this issue would be greatly appreciated.
Thanks
EtiBar
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September 9th, 2025 11:40
I read that one would potentially have to use a jumper cable to reset the CMOS, but I find nothing of the sort shown in the service manual... Could someone give some guidance on where I could find that and from where and to where I have to move the jumper cable?
Thanks
ejn63
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September 9th, 2025 17:39
There are no jumpers on notebook mainboards from Dell. If you're trying to reset the system,
Unplug and remove the base cover.
Disconnect the battery from the mainboard.
Hold the power button for 30 sec.
Reassemble the system and see if it'll power up.
Unless you know you changed the CMOS setting from IRST to AHCI, it would by default have been in IRST mode, as that is how Dell ships the system.
EtiBar
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September 10th, 2025 00:40
@ejn63 thanks for your reply, and for clarifying the lack of jumper cables. I did already attempt to unplug the battery and hold the power button but this made no noticeable difference.
I'm pretty sure it was ahci that the ssd was set to. The ssd is detected in bios but not detected with command prompt when it goes to the automatic repair->advanced repair menu. It gave me the impression it is trying to run the storage system incorrectly under raid. I also tried running it with a different ssd that had been set up for ahci, with the same problem.
Note: In case this provides any clues to what the problem might be.... I tried accessing Bios restore with ctrl+esc ... It almost loads, the screen with options flashes up momentarily but then ends up resetting by itself and brings dell loading logo
EtiBar
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September 14th, 2025 09:24
If anyone has this problem, it was solved by a tech who reinstalled the BIOS. I tried this too but it didn't work - perhaps he did something a bit differently? Is there a difference between using the bios file .exe or the .rcv file, could this have made the difference between it installing successfully or not?
I also noticed that there is something new on the boot configuration in bios which is the https boot - Is this something that needs to be installed seperately? Or is it an inherent part of a healthy BIOS and just a sign what was corrupted has been fixed?
I then had another problem arise - which was TPM module was not recognised, same issues not saving BIOS settings to switch it on. I just kept clicking continue at the error screen until it just randomly worked.
I noticed I have the System Firmware update at v1.4 but the BIOS at 1.38 - how can I downgrade the System Firmware back to 1.38 to reduce any conflicts?
Thanks for the help