BIOS update problems

Hello, my story is pretty long but I'll try to summerize it.

I bought an Acer TC-605 recently and noticed in time that the onboard Realtek network card was working horribly. After many attempts to fix this, I decided to buy an individual network adapter, TC-3468 V2, because it had good reviews, albeit cheap, but that didn't fix anything either, even if I did find the right chipset driver. I was thinking of buying an Intel network adapter which is considerably more expensive but I run on Windows 8.1 x64, and apparently Intel doesn't have any drivers for that yet.

After a ton of research I found by accident the suggestion of updating BIOS, even though it wouldn't guarantee that everything would be back to normal, plus I'd heard that updating BIOS is risky, so I let that idea slide. Then, after too much frustration of disabling/enabling the adapter several times a day, I decided to look into the BIOS issue again, and I discovered something interesting. My BIOS version is P11.B1L, which, according to this thread-  http://community.acer.com/t5/Software-Solutions-and/Acer-Aspire-XC-605-unable-to-update-BIOS/m-p/257762#M3271

-means that the version is for Linux (because of the L letter at the end), but my first OS is Windows 8.1 and the version mentioned above is on the Windows 8.1 compatible list on the Acer drivers list, how is that even possible?!

So my questions are as follows:

1. Is my Linux BIOS version creating a conflict with Windows 8.1 that's causing internet connection issues? If yes...

2. The latest compatible BIOS version for Windows in my case is P21.A4, but upon trying to flash from Windows according to Acer instructions, I got this error: ROM file ROMID is not compatible with existing BIOS ROMID. Is it because my current version is for Linux? If so, is it possible to downgrade to P11.A4 for example and try flashing afterwards?

My specs are as follows:

i5-4440 3.10 GHz

8 GB RAM

GeForce GTX 745 4GB DDR3

TC-3468 V2 Network Adapter

BIOS version P11.B1L

Windows 8.1 N x64

Any help would be greatly appreciated, I really don't want to buy another network adapter if it can be avoided. Thank you.