I created this thread because I think every device forum needs a thread based on bootloader because it is nessessary for develpoment to grow. Developers need a failsafe way to flash back the stock firmware to their device incase testing something they did goes wrong. And, since the bootloader is also how Curtis international chooses to output updates to firmaware for all their Android devices, this will be the place for that as well for all updates on the LT7033 Tablet. This thread will be geared towards "going back" to stock incase you did something wrong or you partially bricked your device.
See second Post for listing of all firmwares for this device and how to make your own backup.imgs
What is a Bootloader?
A bootloader is a program that runs on your computer while your android device is connected to it through the USB cable. The android device is booted into a certain mode often refered to as "download mode" or "flash mode" and the bootloader program can then flash a complete firmware image to your device. It is also specific to manufacturers/devices. This does NOT require ROOT in order to perform..
Our bootloader is called RKbatchtool because it is designed to work with the certain type of CPU or processor that is in our tablets called RockChip.
So How Does it Work?
First thing you need in order for you computer to be able to communicate with your tablet when it's connected is the windows drivers.
Any android device actually has several different drivers that need to be installed for a few different modules inside it:
connected as MTP Storage = MTP driver
connected as USB Mass Storage = Mass storage driver
ADB command line for SDK = ADB Composit driver
Download Mode = Android Bootloader driver
[Step One] Gettin What You Need
You need a few things in order to do this:
1. The latest firmware for your model:
I will confirm that this is an update to android 4.1.1 JellyBean and works much nicer than ICS
LT7033E is posted as discontinued
is the page where you can get official firmware and manuals
2. Windows Drivers
the firmware does come with a drivers folder but i've never had much luck with them. Here are the drivers that have been confirmed by many people as working..
[Step Two] Getting Set Up
First you want to extract the firmware.zip you downloaded for your device. Now open it and inside you will see Firmware.img, power point instructions, and another .zip named RK2918_update_Eng.zip. extract that to inside this folder as well. now open the extracted and this is where you will find the RKBatchtool.exe.
Disreguard the instructions about how to get you tablet into download mode because they are completely wrong.
Also disreguard the drivers inside that folder because i fought with them quite a bit before giving up and using the drivers I posted above. So just let me save you some time.
Next you want to install the bootloader drivers so extract the drivers.zip you got from above and now you need to put your tablet into download mode now.
From powered off:
While holding Volume+ or up
Plug-in your USB cable to the computer
(only use the port on the back of your computer. the one attatched to the motherboard. Mine would not flash AT ALL when using the front usb ports even though it connected and seemed to work fine RKbatchtool would not flash it. it would fail.)
You will here windows make the connected sound and will try to install the drivers but will fail.
Open the device manager and look for unknown device.
Right Click it an select update driver
select Browse my computer for drivers
then Click Have Disk
in the pop-up click browse
go to the drivers folder you just extracted and look for winusb.inf and click Open
ignore any warning about the drivers being signed and install anyway
you should see three drivers to choose from:
The bootloader one is the one you want so select it and click next and install
When it's done installing the driver, you're ready to go.
[Step Three] Flashing your firmware, Update, or recovery.img that you made
Now that your tablet is in download mode and ready to go, go back to the firmware folder from before and drill down to RKBatchtool.exe and right click it. select "Run as Administrator" and hit yes.
In the bottom, Left corner, you should see a square box lit in green. this means it sees your tablet and is ready.
On the top right, you need to select the path to your firmware.img inside the folder you Got from above or from Curtis Int. and it will load the firmware up and say finished in the text box.
Once you achived this, hit the UPDATE button at the bottom and let the magic happen. it will take about 5 min and will reboot your device. then your device will take another 3 - 5 min to boot fully as it's like booting for the first time after you took it out of the box.
Enjoy all the updated goodness and I hope this helped you. If it has please hit the thanks button...