BATTERY AND BIOS UPDATING ISSUES

[Franvalex]

Hello
It all started with an error where my laptop would not start using only the battery. When I pressed the power button, the LED next to the power plug began to flash, even with the battery at 100%. When the power adapter is plugged in I can boot the device without problems, and I immediately disconnect it from the power and the computer continues to function normally. But again, once I turn it off, it is necessary to connect it to the electrical network for it to start again.
I investigated all the solutions I could do from Windows and none of them worked. The next thing I did was a test from the bios to rule out that the problem was not Windows, and it can actually confirm that the problem was not the Operating System.
The results of the battery test were: "Battery not detected/not connected". Evidently the battery was connected, because once the device was started, I could disconnect it from the power and continue functioning normally for hours.
The search for a solution to this problem led me to discover that my BIOS was not updated to the latest version, and in several forums they said that the battery problem could be solved in many cases by updating the BIOS.
I go to the HP support page, look for my laptop model and download the latest version of the BIOS.
And now is when the next problem comes.
When the new BIOS installation is running, there is no problem in the process of copying and verifying the files, the status bar reaches 100%, but it is in the next step "Clearing pending image" when the fans turn on. 100% and the device turns off after 1-2 seconds. When it starts again I get the "CMOS reset 502" message, which returns me to an old version of the BIOS continuing with the battery problem.
I have to say that I have tried updating the BIOS from Windows and from a USB flash drive, and the result has been the same, the update does not complete.
I hope you can help me.
Greetings in advance.

[Nal_NR]

Hi @Franvalex,

Welcome to the HP Support Community. 

I'd be happy to help you! 

I understand that you are having issues with

To resolve the CMOS Reset Error (502), restore the BIOS.

Press enter to restart the PC.

If the error displays after restarting, try to restore the BIOS using a USB drive. For more information, see the "Recover the BIOS using a USB recovery drive" section of the following:

For desktop computers, go to HP Desktop PCs - Recovering the BIOS (Basic Input Output System).

For notebook computers, go to HP Notebook PCs - Recovering the BIOS (Basic Input Output System).

If restoring the BIOS fails, contact HP.

You may also refer to this document for more information.

Hope this helps! Keep me posted for further assistance

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