Some tips to prevent display errors after flashing SPD and MTK devices

I've been receiving lots and lots of complains about screen errors such as touch not working, blue/white/black screen, display is up side down etc after flashing itel phones. The phone boots normal you heat sounds ok but just can't operate it due to this screen error. This mostly happens when you use a firmware (flash file) which is outdated or the display drivers found in ubootloader or uboot file inside the Stock ROM does not match with the current device at hand. For example if an itel IT1408 with build id IT1408-W404-20160902 is flashed with and older firmware lets say IT1408-W404-20160317 the phone might not boot up or have display issues after it boots up.
Note
The following points below are just safe practices
It does not mean that mean that flashing older firmware will always cause screen issues.
This happens only on some devices.
Even though what is written below are safe points, use them at your own risk.


I know you might be wondering now how to know if the firmware you are about to flash corresponds to the device. Its very easy if the device still boots properly, just check the the build number and see if it tally with the file you want to download. The file to be downloaded must not always have the same id with the device. You can also use and updated file to flash the phone. So its either you use a firmware with same id or and updated id.

********
If the phone can't boot, use Miracle Box to read the current Build id of the phone
To Read the build id with Miracle Box,
For Spreadtrum (SPD) devices
Launch Miracle Box
Under SPD tab, Click Readinfo
Under Choose type select the chip of the device
Click Start button and connect phone while holding boot key
Wait for Miracle box to display you all details of the device
From the details, you will see the build id
Now compare with the ROM you downloaded and see if its

For MTK devices
Launch Miracle Box
Under MTK tab, Click Readinfo
Click Start button and connect phone to PC
Wait for Miracle Box to detect device and show all info
From the info you will find the build id of the device
Now compare it with the firmware you want to flash

********
Ok if you still have the guts to flash the device with the firmware which does not correspond to the build id of your device, its always good to do a full stock ROM backup of the device so that after flashing if something is wrong, you can restore the backup.
Use Miracle Box or Infinity CMII to do stock ROM backup.

How to Stock ROM backup for SPD devices with Miracle Box, 
Launch Miracle Box
Under SPD Tab, Click Read
Under Choose, Select chip of the device
Click Start and connec phone to PC while holding boot key
Select were to save backup and click OK
Wait for backup process to complete

How to Stock ROM backup for MTK devices with Miracle Box
Launch Miracle Box
Under MTK tab, Click Read
If you want the backup to save as scatter file, tick scatter file else don't tick
Click start button and connect phone to PC
Select were to save backup and click OK
Wait for backup process to complete

********
If you just want ignore all the process above and go on directly with the flash process, at least take a second or rwo not to select uboot (MTK devices) or ubootloader (SPD devices) before you begin the flash process it might save you from a lot of problem.


Conclusion
Yeah I know I've not uploaded some new firmware of some devices thats because of my day in day out schedule and of course DATA for uploading LOL but I still try my best to be updating the files as quick as possible. So if you have searched around and can't find the Stock ROM you are looking for, this few tips might just come in handy. If you have more  tips, you can always share for others to learn.