The Acer One T9-422L is a budget-friendly 4G LTE tablet designed for media consumption and on-the-go connectivity. It features a large 10.1-inch display, a substantial battery, and is powered by the octa-core MediaTek Helio P35 (MT6765) processor. This guide provides the official stock ROM, which is essential for unbricking the device, fixing software bugs, removing a Google FRP lock, or performing a complete factory restore.
Important: This firmware is specifically for the Acer One T9-422L. As a MediaTek device, it requires the SP Flash Tool for flashing. Flashing this on a different model will cause a hard brick. This process will erase all data on your device.
Quick Device Specs
- Device: Acer One T9-422L
- Release year: 2022
- Chipset: MediaTek Helio P35 (MT6765)
- Display: 10.1″ IPS LCD, HD+
- Battery: 6000 mAh
- Original OS: Android 12
Required Downloads
To flash a MediaTek device, you will need the specific drivers and flashing tool. You can find the downloads for these in our main guide linked below.
- SP Flash Tool
- MediaTek VCOM USB Drivers
Stock ROM (Firmware)
| Build | Android | Type | Download | Chipset |
|---|---|---|---|---|
| 22.09_050125 | 12 | SP Flash Tool Firmware | Download | MediaTek |
How to Flash the Stock Firmware
Flashing the stock ROM onto your Acer One T9-422L requires a Windows PC and the SP Flash Tool. The process involves installing the MediaTek VCOM drivers, loading the MT6765_Android_scatter.txt file from the firmware into the tool, and then connecting your powered-off tablet to start the flash. This will completely restore your device to its original factory software.
For detailed, step-by-step instructions with screenshots and tool download links, please follow our comprehensive pillar guide: How to Flash Firmware with SP Flash Tool.
Device-Specific Troubleshooting for Acer One T9-422L
- Correct Driver Installation: The most common failure point is incorrect drivers. If the tool doesn’t see your tablet, you must install the MediaTek VCOM drivers, which often requires you to disable ‘Driver Signature Enforcement’ in Windows first.
- Using the “Boot Key”: To initiate the flash, power the tablet off completely. Press and hold the Volume Down button, and while holding it, connect the tablet to your PC. The tool should then detect it and begin the process. If Volume Down doesn’t work, try holding both Volume Up and Volume Down together.
- Fixing Google FRP Lock: If you’re locked out of your tablet by Google’s Factory Reset Protection (FRP), flashing this stock ROM will perform a complete wipe and remove the locked account.
- SP Flash Tool Auth/DA Error: Some newer MediaTek devices like this one may have Secure Boot enabled. If you get an authentication or DA (Download Agent) error, it means the standard SP Flash Tool is being blocked. You may need to find a custom DA file specific to the Helio P35 chipset and load it into the dedicated field in SP Flash Tool before loading the scatter file.
FAQs
Q1. Can I make regular phone calls on this tablet?
Yes. The Acer One T9-422L is an LTE-enabled tablet with a SIM card slot, which means you can use it to make and receive cellular calls and SMS messages, just like a smartphone.
Q2. My tablet is stuck on the Acer logo. Will this fix it?
Yes. Being stuck on the logo (a “bootloop”) is a classic software problem. Flashing the stock ROM is the most reliable way to fix this issue as it completely reinstalls the tablet’s operating system.
Q3. What is a “scatter file”?
The scatter file (e.g., MT6765_Android_scatter.txt) is a crucial map for MediaTek firmware. It tells SP Flash Tool the name, size, and location of every partition on the device’s storage, ensuring each part of the software is flashed to the correct place.
Q4. Will this process erase my data?
Yes. Flashing the stock ROM with SP Flash Tool will perform a full factory reset and completely wipe all personal data, apps, and settings from your device.
