You will have to do this from inside the WeOs because I'm not sure where to get the eUpgrade tool, maybe it comes with the egalax drivers...anyhow that's not our concern at this point.
First, make sure you have a USB Keyboard and Mouse handy.
Now, open up a shell and
$>sudo unzip TouchPanel_YFO_v1006h.zip -d /usr/share/tiitoo/firmware/
$>eUpgrade -f /usr/share/tiitoo/firmware/YoungFast_11p6_24x43_72A1v1006h_f04_dsab_ASG.EGXP
Now you will see something like:
*) EETI firmware upgrade tool version: 1.03.1011 **** DO NOT TOUCH THE SCREEN DURING RUNNING!! **** (I) Found a PCAP device on /dev/hidraw0 (I) Model: PCAP72A1 (I) Type: PCAP7200 Series (I) Version: 1.005f (I) Image file [/usr/share/tiitoo/firmware/YoungFast_11p6_24x43_72A1v1006h_f04_dsab_ASG.EGXP]: Opened (I) Load image file: OK (I) Waiting............
and then pinnwand will restart. DO NOT PANIC IF THE TOUCHSCREEN DOES NOT REACT TO YOUR TOUCH. Just do the eupgrade one more time, this is what happened with me,
eUpgrade -f /usr/share/tiitoo/firmware/YoungFast_11p6_24x43_72A1v1006h_f04_dsab_ASG.EGXP
If fortune does not side with you then you can always revert to the older firmware which you should find under the same folder: /usr/share/tiitoo/firmware/YoungFast_11p6_24x43_72A1v1005...
Best of luck, if you worried about doing this wait for the official update...!