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If your HP Pavilion 15-ab112nl laptop keeps restarting repeatedly, even after trying to boot from a Windows recovery USB, don’t worry—you’re not alone. Here’s a simple step-by-step guide to help you fix this issue by downgrading your BIOS to an earlier version, which can often resolve boot loops caused by BIOS updates.

First, understand that a BIOS update can sometimes cause compatibility issues, especially if the update isn’t working properly or if your hardware has specific needs. Since updating to BIOS version F.45 resulted in a stop error (ACPI_BIOS_ERROR), reverting to an older BIOS version like F.44 or F.43 might help.

Here’s what you need to do:

Download the BIOS version you need:
Visit the official HP support website and look for your laptop model, HP Pavilion 15-ab112nl. Since the HP website may not list older BIOS versions directly, you might need to look in the driver or BIOS archive section. If you can’t find BIOS versions F.44 or F.43 listed, try reaching out to HP support directly for a link to the older BIOS files.

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Create a bootable USB drive:
Once you have the BIOS file, you’ll need to create a bootable USB stick. You can use tools like Rufus or Windows Disk Management to prepare the USB. Make sure the BIOS file is placed on the USB and that the drive is formatted properly, usually in FAT32 format.
Enter the BIOS setup:
Turn off your laptop, then power it on and press the F2 key repeatedly to enter the BIOS menu. Navigate to the firmware or BIOS update section.
Perform the BIOS downgrade:
Follow the instructions provided with the BIOS file to initiate the update process. Usually, this involves selecting the BIOS file from your USB drive when prompted. Be very careful to choose the correct file and follow the steps exactly—interrupting this process can brick your device.
Complete the update and restart:
After the BIOS downgrade is finished, restart your laptop and see if it boots normally. If the issue was caused by the BIOS update, this should fix the reboot loop problem.

If you have trouble finding the older BIOS files or need more detailed instructions, reaching out directly to HP support can be very helpful. They can provide official links and guidance specific to your notebook.

Remember, when working with BIOS updates, always ensure your laptop is connected to power and do not turn off the device during the process. Patience and careful steps will help get your laptop back to normal operation.