Here is a Haier T750W Stock ROM Firmware which can be used to load and flash stock firmware on any Haier T750W of this exact variant. Any MTK Flash tools can download and flash this Haier T750W flash file on your T750W so long as that MTK Flash Tool supports MTK Scatter File.
Since most major software malfunctions on any MTK Android devices can only be corrected by flashing, this T750W flash file, if properly used, can unbrick (debrick) your T750W and also corrects any software issues your Haier T750W may currently have. Also, keep in mind that when you load stock firmware on your Haier T750W using any MTK flash tool, your Haier T750W will be reset to factory defaults settings and by that, definately, your UserData will be lost including contacts, messages and others.
Note: If your T750W is already bricked and you want to unbrick it, you will need to pay closer attention to the tutorials contained below here.
Haier T750W Stock ROM Firmware Download Link(s)
1. Haier T750W_20140507 (Android 4.2.2) Stock Firmware Download Link
How to Flash Stock Firmware On Haier T750W
1. Download your Haier T750W stock ROM firmware from the link above.
2. Extract the Haier T750W Firmware you downloaded from the link above onto a folder on your PC.
3. Download and install MTK android device drivers on your PC. You may skip this step if you have installed MTK drivers on your PC already otherwise, download MTK drivers here
4. Now, choose either of the tools listed below here to load the stock firmware on your Haier T750W.
2. NCK Box
3. Miracle Box
See video tutorial here: How to Flash MTK Android Devices Video Tutorial
Note
1. Each of the tools listed above contained step by step guides with illustrated pictures on how to flash stock firmware on your Haier T750W.
2. If your device is bricked already, I recommend that you use NCK Box or SP Flash. Both are the safest toolS for flashing MTK Android devices.
3. If you require any further assistance, simply drop your comment detailing the issue(s) and I shall help you revive your Haier T750W, if need be.