Here is a Vivo Y11iw Stock ROM Firmware which can be used to load and flash stock firmware on any Vivo Y11iw of this exact variant. Any MTK Flash tools can download and flash this Vivo Y11iw flash file on your Y11iw 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 Y11iw flash file, if properly used, can unbrick (debrick) your Y11iw and also corrects any software issues your Vivo Y11iw may currently have. Also, keep in mind that when you load stock firmware on your Vivo Y11iw using any MTK flash tool, your Vivo Y11iw will be reset to factory defaults settings and by that, definately, your UserData will be lost including contacts, messages and others.
Note: If your Y11iw is already bricked and you want to unbrick it, you will need to pay closer attention to the tutorials contained below here.
Vivo Y11iw Stock ROM Firmware Download Link(s)
1. Vivo Y11iw_PD1224CWO_A_1.15.4_MT6582_130035
How to Flash Stock Firmware On Vivo Y11iw
1. Download your Vivo Y11iw stock ROM firmware from the link above.
2. Extract the Vivo Y11iw 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 Vivo Y11iw.
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 Vivo Y11iw.
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 Vivo Y11iw, if need be.