Q1. The screen on my Infinix Smart 6 has "ghost touches" or is unresponsive. Can this be fixed?

Yes, this is a widely reported issue, and it's often a software or calibration problem. Flashing the stock firmware is a crucial troubleshooting step that reinstalls the correct touchscreen drivers and can resolve these erratic behaviors.

Q2. My phone is freezing and showing "System UI has stopped." What should I do?

This indicates software corruption. The most reliable solution is to flash the stock firmware using this guide. It will replace all damaged system files and restore the phone's stability.

Q3. My phone is charging very slowly or not at all. Is the charging port broken?

It could be a hardware issue, but first, you should rule out software. A bug in the power management drivers can cause charging problems. A full firmware flash will restore these drivers. If the problem persists after flashing, you should have the hardware checked by a technician.

Infinix Smart 6 (X6816B) Stock ROM (Firmware)

The Infinix Smart 6 (X6816B) is a budget-friendly smartphone from 2022, known for its large 6.6-inch display and a massive 5000 mAh battery. It runs on Infinix’s XOS based on Android 11 (Go Edition). While a popular choice for its features, users have reported several software-related issues. The most common complaints include an erratic or unresponsive touchscreen with “ghost touches,” frequent system freezes or “System UI has stopped” errors, and charging problems. For users facing these issues, or for those needing to recover a bricked device or bypass the FRP lock, flashing the official stock firmware is the definitive solution.

ℹ️ Important Note:
This phone is powered by a UNISOC (Spreadtrum) chipset and requires the SPD Upgrade Tool to install the firmware. This procedure will completely erase all your personal data. Ensure you have backed up any important files before you begin.

⚠️ Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Backup Your Data: All your contacts, photos, and files on the phone’s internal storage will be permanently wiped.
Charge The Battery: To prevent the phone from shutting down during the update, ensure the battery is charged to at least 50%.
Windows PC & USB Cable: You will need a Windows computer and a standard micro USB cable to perform the flash.

📱 Quick Device Specifications

Device: Infinix Smart 6
Model: X6816B
Chipset: UNISOC SC9863A
Display: 6.6″ HD+ IPS (1600×720)
Operating System: Android 11 (Go Edition)
RAM: 2GB
Storage: 32GB
Battery: 5000 mAh

🛠 Required Tools & Downloads

File / Tool	Download Link
SPD Upgrade Tool	Download Tool
UNISOC/SPD SCI USB Drivers	Download Drivers

⬇️ Infinix Smart 6 (X6816B) Stock ROM / Firmware

Android Version	Filename	Release Date	Size	Download Link
11 (Go Edition)	X6816B-…-220218V3.zip	2022-02-18	3.79 GB	Download (MediaFire)

Quick Steps to Flash Infinix Smart 6 Firmware

Download and install the SPD SCI USB Drivers on your Windows PC.
Extract the firmware ZIP file (X6816B-...-220218V3.zip) to get the .pac file inside.
Extract and run the SPD Upgrade Tool (UpgradeDownload.exe).
Click the single gear icon (“Load Packet”) and select the firmware .pac file.
Click the play icon (“Start Downloading”). Power off your phone completely.
Press and hold both Volume Up + Volume Down keys, and while holding them, connect the phone to the PC. The tool will detect the phone and start flashing. You can release the keys once the progress bar appears.
A green “Passed” message will appear upon completion. Disconnect your phone and power it on.

For a more detailed, step-by-step guide on this process, please refer to our main tutorial:
👉 Full Tutorial: How to Flash Firmware with the SPD Upgrade Tool

❓ Frequently Asked Questions (FAQs)

Q1. The screen on my Infinix Smart 6 has “ghost touches” or is unresponsive. Can this be fixed?: Yes, this is a widely reported issue, and it’s often a software or calibration problem. Flashing the stock firmware is a crucial troubleshooting step that reinstalls the correct touchscreen drivers and can resolve these erratic behaviors.
Q2. My phone is freezing and showing “System UI has stopped.” What should I do?: This indicates software corruption. The most reliable solution is to flash the stock firmware using this guide. It will replace all damaged system files and restore the phone’s stability.
Q3. My phone is charging very slowly or not at all. Is the charging port broken?: It could be a hardware issue, but first, you should rule out software. A bug in the power management drivers can cause charging problems. A full firmware flash will restore these drivers. If the problem persists after flashing, you should have the hardware checked by a technician.