Laptop requires BIOS update without battery

[Williamss0305]

The model of my laptop : HP Laptop 15-dy2792wm (7Z899UA). 

Ths issue I'm having started just a couple days ago when suddenly my laptop stopped charging. (I have it plugged in 24/7) So I realized immediately before my charge dropped below zero. Regardless it hit 0% eventually and obviously. I removed the old battery and replaced it and it seemed to work fine, that is until it died very quickly. It was at 17% and the instructions on the new battery said to let it drop to 2% then fully charged it not sure why, but before I realized it, it had died or just black screened from about 15%.

It now only turns on when I continue to change the outlet with the charger. 

I have a couple problems.

1. It says CMOS reset 502, which I found online I need to update my BIOS settings. (My laptop doesn't have a CMOS battery or I'm blind)

2. Regardless of whether the battery is in the laptop, when it turns on again after having to replug it. It buzzes and stays on only for about a minute. 

I would like to know how I'm supposed to update BIOS without charge and why it did this in the first place, the charger doesn't appear to be damaged and the charger port plugs in fine. Battery and Charger have same wattage. I also tried doing a restore for some reason still didn't work. Went to home screen login for profile then black screens anytime it tries to go into the actual computer. It's completely fine loading a blue screen section with multiple buttons such as reinstall windows, advanced options, recovery, restore, etc.  

Would downloading the BIOS update onto a file on a USB drive from another computer work? I can still access the administrative window to type commands from the blue screen options. Would it even be able to access such files if my computer can't turn on fully? 

[zoey7886]

@Williamss0305, Welcome to the HP Support Community!  

Thanks for reaching out about your query regarding BIOS Update Without Battery for HP Laptop! 

We're thrilled to have the opportunity to assist you and provide a solution.  

To update the BIOS on your HP Laptop 15-dy2792wm (7Z899UA) without a battery, you can follow these steps:

Ensure Reliable Power Source:

• Connect AC Adapter: Plug in your AC adapter to ensure the laptop has a stable power supply throughout the BIOS update process.

Downloading BIOS Update:

• Visit HP Support Website: Go to the HP Support website.
• Enter Laptop Model: Search for your specific laptop model (HP Laptop 15-dy2792wm) to find the relevant BIOS update.
• Download BIOS Update: Download the BIOS update file provided for your laptop model.

Prepare USB Drive:

• Format USB Drive: Use a USB drive formatted to FAT32.
• Copy BIOS Update: Transfer the BIOS update file to the USB drive.

Access BIOS Setup:

• Start Laptop: Turn on your laptop and immediately press the F10 key repeatedly until the BIOS setup screen appears.

Perform BIOS Update:

• Navigate to BIOS Update Option: In the BIOS setup, find the option for updating the BIOS (might be listed under Diagnostics or Tools).
• Select Update from USB: Choose the option to update the BIOS from the USB drive.
• Follow Instructions: Follow the on-screen instructions to complete the BIOS update process.  

Hope this helps!

Hope this helps! 

Take care, and have an amazing day!  

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Regards, 

[Williamss0305]

Thank you for your reply, I was able to make a recovery USB and successfully update the BIOS settings. Unfortunately I think I have a different problem. 

The laptop still doesn't boot into windows and still shows CMOS reset 502. Although my laptop model doesn't appear to have a CMOS battery and BIOS is updated. The buzzing sound as well still not gone, I believe I'll just take the laptop to a professional soon to see if I can get it fixed. Again, thank you for your assistance.