Here is a YXTel C900FM Stock ROM Firmware which can be used to load and flash stock firmware on any YXTel C900FM of this exact variant. Any MTK Flash tools can download and flash this YXTel C900FM flash file on your C900FM 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 C900FM flash file, if properly used, can unbrick (debrick) your C900FM and also corrects any software issues your YXTel C900FM may currently have. Also, keep in mind that when you load stock firmware on your YXTel C900FM using any MTK flash tool, your YXTel C900FM will be reset to factory defaults settings and by that, definately, your UserData will be lost including contacts, messages and others.
Note: If your C900FM is already bricked and you want to unbrick it, you will need to pay closer attention to the tutorials contained below here.
YXTel C900FM Stock ROM Firmware Download Link(s)
How to Flash Stock Firmware On YXTel C900FM
1. Download your YXTel C900FM stock ROM firmware from the link above.
2. Extract the YXTel C900FM 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 YXTel C900FM.
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 YXTel C900FM.
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 YXTel C900FM, if need be.