Dell Support Assist BIOS Update made PC Unable to Start correctly

@origamik  -  I see those acpi errors are fairly common when running Linux or Ubuntu, and can happen with Windows too.

When you image a HDD, the imaging app compresses the files so they take up much less space on the drive where the image is stored. Macrium doesn't work with Linux, but there are similar apps available. At the minimum, just copy all your personal files on to an external USB drive to be safe.

I wouldn't attempt to downgrade BIOS because that might brick your motherboard and even if it got downgraded, it still might not solve the problem.

Have you ever replaced the motherboard's coin cell battery (separate from the main power battery)?  This requires you to open the case to access that battery, which isn't as easy as on a desktop PC. The Owners Manual has instructions. If this is beyond you abilities, maybe you have a geeky friend to help because you don't want to damage the PC.

Removing that battery (with main power battery already removed) and pressing/holding the power button on PC for ~30 sec will reset BIOS and might clear those acpi errors. 

Then, you could try installing Win 10 again. Be sure to run Windows Update to get all the latest updates and Dell's Inspiron 3147 drivers can be downloaded here, if Windows Update doesn't install them. You''d enter your Service Tag (don't post it here) on the Support page and it will show you all the right drivers for your system.

Assuming that works with no more errors, install all your apps and copy all your personal files back onto the HDD. Otherwise, you can always install Linus again...

Thank you so much! The owners manual is such a great book.

I could open up the laptop and replace the coin battery. But as it already says, that it resets the bios to factory, I want to ask, is this any different than just going into the bios and restoring the defaults from there?

My bios does say that it is on A12, so I believe that the update of the bios was successful. But, I have already tried to install windows 10 and even windows XP on the laptop but ever time I am greeted with a blue screen of death with the same error (even on xp). 

I actually went to the SupportAssist website and entered the service Id. I found what I had downloaded and installed. It’s this

I found out about this thread on this forum https://www.dell.com/community/Inspiron/Dell-3147-ACPI-BIOS-ERROR-in-Windows-10-2004-update/td-p/7631786 , according to it someone had success by downgrading their bios. But I will trust what you say. 

if I can get a confirmation from you then I will go buy the new coin battery right away.

"Factory" and "Default" BIOS settings might be different. If the battery is weak/dead, "Factory" settings might have gotten scrambled or reset to "Default" settings. "Default" settings are hard-coded on the BIOS CMOS chip, and "Factory" settings might have changes from "Default". "Factory" changes would be retained as long as the battery is good.

Without knowing if/how "Factory" and "Default" compare, it's hard to know. You can try resetting BIOS to "Default" from inside BIOS, but the motherboard battery may still be weak/dead. I guess it's worth a try before pulling the PC apart. And even after replacing the battery there's no guarantee that solves this problem.

That thread doesn't say how they downgraded BIOS, but here's a link to BIOS A05, if you can find out how they downgraded and decide to do it. (Note that link is not a Dell site.)  And there is a potential to brick the motherboard, so you downgrade entirely at your own risk...

I don't see the BIOS settings on the support page, but you'd need to check these settings, if available, and see what options you have for:
SATA Mode (or SATA Operation)
UEFI and/or Legacy Options ROM
Secure Boot

If this is a 64-bit CPU, Win XP won't run unless it's the 64-bit version. And if it's a 32-bit CPU, you'd need the 32-bit version of Win 10...

Hello, the laptop is 64-bit and so was windows xp (I think).

here is the. Official bios update for the older version from dell https://www.dell.com/support/home/en-in/drivers/driversdetails?driverid=r62631 .

I will take a photo of each screen of the bios and change the battery as soon as I can find a replacement.

I won’t try to downgrade by myself without your approval but I think that using rufus to make a live ms-dos installation on a usb drive and then navigating to the file and running the file would maybe do the trick?

I would also like to know what is meant by ‘potential to brick motherboard’ ? What could be the worst that happens?

@origamik  - Let's be perfectly clear, I'm not going to give you "approval" to downgrade BIOS on your laptop. It's your PC and only you make all the decisions.

I can help answer questions, but it's entirely your decision whether to downgrade BIOS or not. You still have to find out exactly how to do that because you can't run a BIOS downgrade the same way you'd run an upgrade. 

"Brick the motherboard" - If a BIOS install fails, which is always a risk, the motherboard will be permanently damaged and will have to be replaced.  In other words, the motherboard is about as useful as a brick...

I understand your reasoning. I do not want to to make you feel entitled to helping me, I’m sorry. 

I understand that downgrading the bios has serious risks, but it also has the hope of fixing the pc. You say that downgrading the bios can’t be done the same ways as updating but can you elaborate a little on that?

I would greatly appreciate if you are able to find somewhere that documents the procedure for doing that. Just like in that thread where the person claims to have successfully downgraded. 

I'm here to help, not make the decisions, is all I'm saying.

Dell doesn't document how to downgrade BIOS on most of its (older) PC models and it varies depending on which company wrote the BIOS code for the PC in question. 

Since somebody claimed to have downgraded BIOS on this model in the thread you linked, that may be your only source for this info. So you may have to wait a few days to see if anyone responds to your post over there...

BTW: The link you posted above for "Official bios update for the older version from dell" is NOT -repeat- NOT for your Inspiron 3147. Your link opens a page for BIOS A09 for Dell PowerVault 770N server. So I have no idea where you got that link.

Maybe it's time to take this PC to a reputable PC shop and let them clean it up and install Win 10 for you...