Here's a newer ROM for the Teclast P90HD based on official Teclast firmware v1.26 dated 9/24/14...yeah, I know...it's still pretty old, but newer than the firmware I made v1.0 with (which was v1.24).

This ROM is:

Rooted with Koush Superuser
Debloated of Chinese apps
init.d support added
busybox support added
Google Play Store fixes added
2, 4, 6, 8, 10 or 12gb user app space by selecting the desired parameter file (6gb default)
Expanded system.img to use the whole 1gb partition
Multi user support added (no need to run Xposed Framework for that anymore)
Reboot App by Petrus

Still no working CWM or TWRP Recovery for this tablet that I know of. If you have one, please share a link to it.

Read the First Time User's Guide for flashing instructions. Here's a brief overview:

1. Download the ROM Kit.
2. Unzip the kit on your desktop, or wherever you downloaded it.
3. Open the AndroidTool.exe
4. With your tablet turned on, with USB debugging turned off (in settings), plug in the USB cable. Be sure to always use the USB cable that came with the tablet.
5. Make sure the USB drivers are installed for the Rockchip device. (see the First Time User's Guide for details, if you are having trouble)
6. You should see the tablet recognized by "Found One MSC Device" in the bottom of the tool.
7. Click the "Switch" button to reboot the tablet to flash mode. The screen will turn black.
8. Click "LowerFormat". It will count to 100% (very quickly).
9. Click "Run".
10. When the flash is finished, the tablet will boot into stock recovery and will format your partitions.
11. First boot will take a little longer than usual...just be patient and watch the boot animation.
12. Once the tablet boots to the system...you will have a fresh, rooted system to work with.
Download 

Enjoy!!!!

Please.....Don't forget to donate....this helps me continue further ROM development.