I have a similar model to yours. BIOS 307, Z3375, plastic version of the t100 sold in Canada. Model number on the keyboard bottom is T100TA-DB12T-CA
Edit. Checked and I have Bios 313 now. Upgraded from 307.
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So this is my first post on here. I have a t100t (according to the sticker, t100ta according to system info.) I updated the bios from 307 to 313 and it worked. I was sweating bullets though. The only reason I updated was due to the incredibly weak volume with the latest drivers and I wanted to confirm that the latest bios has remedied the weak volume! My unit has the 3775, 64GB hard drive. Replaced my main laptop which was a macbook air since it was over kill for all I did.. (Youtube videos, teraria, and web browsing) Anyhow just wanted to post that here that it fixed the low volume! I also no longer notice the static on my headphones anymore that plagued the unit before too.
Edit- Never mind, there is still some weird feed back when I close out of a youtube video through the headphones but its only for a second.
Install all drivers from the ASUS website for the T100TA.
One way to do that is to go into device manager(search for it or right click the windows start button in the corner) and right click each individual device inside each folder and search automatically for latest drivers. This ensures you get the latest and correct drivers for your version.
Specifically for audio drivers go to Sound and right click each.
Also I recommend updating the battery and graphic drivers as well.
Open Device Manager -> click the '>' next to Batteries -> right click Microsoft AC Adapter and Microsoft ACPI Compliant Control Method Battery-> click Update Driver Software for each -> Search Automatically for Driver Software
What battery version should be after the update? Currently I have 10.0.10240.16384 (date 21.06.2006) for both Microsoft AC Adapter and Microsoft ACPI Compliant Control Method Battery and Microsoft AC Adapter.
Windows can't find anything newer and claims that the driver is up-to-date.
Are you using Windows 8.1 or 10?
I'm using 10, that might be the difference.
In that case, can you right click go to properties and rollback the driver and then update it again? That can fix problems easily as well.
Currently I'm using Windows 10. I'll try your suggestion to update it.
Edit:
Rollback option is not available, so I've just tried to uninstall battery driver but it didn't make any difference. After the reboot battery version is still the same and can't be updated (of course if there is a newer version of the battery driver).
I've read some posts that after updating from Win 8.1 to 10 battery performance improves but I'm experiencing exactly something opposite. Before update my T100 was able to run almost 8h 30 mins in idle state (tested :D) but after the update it is no more than 6h 20 mins. Where are the two hours gone?