[Q] Best sequence of steps to upgrade TF300T 10.4.2.20 running Android 4.1.1

Sorry for the n00b questions. I'm confused by the large number of posts about rooting the TF300T which are for different firmware and Android versions.

I have a TF300T running Android 4.1.1. The firmware is JRO03C.US_epad-10.4.2.20-201212028.

I'd like to upgrade to Android 4.4 KitKat.

What is the correct sequence of steps? Some of the posts I read say that the device needs to be unlocked first by downloading a utility from Asus, but I don't see an unlock utility that's made for this firmware version.

Also, I don't have a USB cable for the tablet. Can I flash from a microSD?

Thanks in advance!

Thanks for the tips!

I was able to download both the unlock utility and the 4.2 firmware from this page:
support.asus.com/download.aspx?SLanguage=en&m=ASUS+Transformer+Pad+TF300T&os=8

NOTE: the direct URLs listed below only work outside of China. See the page above for download links if you are in China or Taiwan

NOTE: the following URLs are for the US firmware version of the TF300T (build number contains "US"). See the page above for download links for other regions.

The steps are as follows:

1. enable installation of applications from unknown sources (Settings -> Security -> check the Unknown Sources box)

2. download the V7 unlock utility and install on your tablet. The tablet will reboot and you will see "device unlocked" in the top left corner during boot. This is the direct link to the V7 unlock utility (this should be downloaded directly from the tablet):
dlcdnet.asus.com/pub/ASUS/EeePAD/TF300T/UnLock_Device_App_V7.apk


3. download the 10.6.1.8 firmware to your PC from here:
dlcdnet.asus.com/pub/ASUS/EeePAD/TF300T/TF300T-US_epad-user-10_6_1_8-UpdateLauncher.zip

4. extract the ZIP file. There will be another ZIP file inside. Copy this "internal" ZIP file to a microSD card

5. insert the microSD card into the tablet. The new firmware should be detected automatically and an exclamation sign icon will appear in your system tray. Touch it and follow the prompts to perform the upgrade.

You should now be on Android 4.2.1 and firmware US_epad-10.6.1.8

f69m said:

10.6.1.8 is likely to cause issues with KitKat ROMs. Try to find 10.6.1.27.5 or 10.6.1.27.1.

Click to expand...

Click to collapse

Thanks again! I can confirm that 10.6.1.8 does not work with KitKat. The tablet simply hangs during boot.

I was successful with 10.6.1.27.5