After looking at the BIOS version I noticed that it is not urgent or even recommended but rather popular. And the description is "Optimize battery charge algorithm." Considering the trouble you are having and the fact that the BIOS version only has that single effect, I would pass it by. The possibilities for something to go wrong seem to outweigh the slight benefit. And considering that the 1510 is somewhere in the 10-13 years old range there seems to be little to no reason to update the BIOS as you may be replacing that system in the not too distant future. 
I'm stuck with that flashing process. I could download and save the BIOS file to the desktop, but I keep getting errors such as 1275, saying I need to log in as admin to install it - but I am the laptop's admin, and I right-clicked the file to execute it as admin. Still stuck, after 4 weeks of constantly trying and failing, and DELL'S support didn't take me much further, because it wasn't them who wrote the BIOS, but Phoenix, and from them, I can't expect any help either.  My Vostro runs on Windows 10 home 64bit, Version 21H2, Build 19044.1387, 4GB RAM, C:\ is a 240 GB SSD. Those (the RAM and the SSD) are the only changes I made with that 13-year-old machine. The BIOS file I got is from 2009, the next available one dates from 2020. What else did I try to flash the device: Made a bootable DC-ROM, after launching I typed C:\Users\[username]\Desktop\VA15.exe. what does he tell me? "Filename or command not recognized." Now I had been asking around for help and finally, someone told me, the file I am trying to use was the same as the one from 2009.  Is this possible? If yes, I'll abandon my futile efforts. If that is not true, then I'd like to ask you for more help to get things done.  Hoping to have a reply.
Vostro 1510 64bit processor, BIOS flash issue re. WinPhlash error 1275