Q1. My phone has no signal or cannot detect any SIM card after a software crash. Will this fix it?

Yes, this is a common reason to flash stock firmware. Network and SIM detection issues are frequently caused by corruption in the modem (NV) partition. Flashing the complete official firmware will rewrite the modem files and NVRAM, restoring your phone's ability to connect to mobile networks.

Q2. The device is stuck in a factory mode or test mode loop. Can flashing help?

Absolutely. This abnormal behavior often indicates severe system file corruption. A full firmware flash will replace the entire operating system, eliminating any test mode triggers and restoring standard boot behavior.

Q3. After a failed update, my phone's IMEI became null or invalid. Will this restore it?

In most cases, yes. The IMEI is stored in the NVRAM partition. Flashing the original stock firmware for your specific model typically includes the correct files to repair and restore the IMEI information, returning your device to a valid state.

Archos Access 50 Color 4G Stock ROM Download (SC9832 Firmware Flash File)

The Archos Access 50 Color 4G is a budget-friendly smartphone featuring a 5-inch display and 4G LTE connectivity. Launched in 2018, it runs on Android 7.0 Nougat and is powered by a Spreadtrum (UNISOC) chipset. If your device is plagued by network issues, persistent app crashes, forgotten passwords, or a bricked state, installing this official stock firmware is the most reliable method to restore its original functionality and performance.

CRUCIAL WARNING:
This device uses a Spreadtrum (UNISOC) SC9832 chipset. The flashing process for this chipset is different from Qualcomm or MediaTek devices and requires a specific tool. Using the wrong tool can hard-brick your device. This process will erase all user data.

Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Data Backup: This process will completely wipe your phone. Backup all personal data, including contacts, messages, and media files.
Battery Level: Ensure your phone has a minimum of 60% battery charge to prevent any interruptions during the firmware write process.
PC Requirements: You need a Windows computer and a high-quality micro-USB data cable. Using a USB 2.0 port is recommended for stability.
Driver Installation: You must install Spreadtrum/UNISOC USB drivers on your PC for the device to be recognized in upgrade mode.

Quick Device Specifications

Device Model: Archos Access 50 Color 4G
Release Year: 2018
System-on-Chip (SoC): Spreadtrum (UNISOC) SC9832
CPU: Quad-core 1.3 GHz Cortex-A7
GPU: ARM Mali-400 MP2
Network: 4G LTE
Display: 5.0″ FWVGA (854×480 pixels)
Memory: 1GB RAM / 8GB Storage
Operating System: Android 7.0 Nougat

Required Tools & Downloads

File / Tool	Download Link
SPD Upgrade Tool (ResearchDownload)	Download Tool
Spreadtrum (UNISOC) USB Drivers	Download Drivers
Android ADB Drivers (Optional)	Official Download

Archos Access 50 Color 4G Stock ROM / Firmware

Model	Android Version	Chipset	Tool	Download Link	Size
Access 50 Color 4G	7.0 Nougat	Spreadtrum SC9832	SPD Upgrade Tool	MediaFire	~750 MB

Quick Flashing Guide

Download and extract the firmware file (Archos_Access_50_Color_4G_SC9832_20180627_7.0_OTA.zip), the SPD Upgrade Tool, and the Spreadtrum USB Drivers on your Windows PC.
Install the Spreadtrum/UNISOC USB drivers on your PC. A reboot may be required.
Launch the SPD Upgrade Tool (ResearchDownload) as Administrator.
Load the firmware files. The exact method varies; you may need to load a PAC file or select the folder containing the .dat and .bin files extracted from the ZIP.
Power off your phone completely. Click “Start” or “Download” in the tool, then connect the powered-off phone to your PC via USB cable. The tool will detect the phone and begin flashing automatically. Wait for a “Pass” or “Success” message before disconnecting.

Important: The process for Spreadtrum/UNISOC devices can vary significantly. For detailed, step-by-step instructions with screenshots, please follow our dedicated guide:

Full Tutorial: How to Flash Firmware with the SPD Upgrade Tool

Frequently Asked Questions (FAQs)

Q1. My phone has no signal or cannot detect any SIM card after a software crash. Will this fix it?: Yes, this is a common reason to flash stock firmware. Network and SIM detection issues are frequently caused by corruption in the modem (NV) partition. Flashing the complete official firmware will rewrite the modem files and NVRAM, restoring your phone’s ability to connect to mobile networks.
Q2. The device is stuck in a factory mode or test mode loop. Can flashing help?: Absolutely. This abnormal behavior often indicates severe system file corruption. A full firmware flash will replace the entire operating system, eliminating any test mode triggers and restoring standard boot behavior.
Q3. After a failed update, my phone’s IMEI became null or invalid. Will this restore it?: In most cases, yes. The IMEI is stored in the NVRAM partition. Flashing the original stock firmware for your specific model typically includes the correct files to repair and restore the IMEI information, returning your device to a valid state.

Device-Specific Troubleshooting

Tool Fails to Detect Phone: Spreadtrum/UNISOC chips require very specific driver versions. If the SPD Upgrade Tool doesn’t see your device, uninstall all previous phone drivers from Device Manager. Then, install the recommended Spreadtrum drivers again, often in “manual” mode by pointing to the driver INF file when the phone is connected in preloader mode.
“Auth File Missing” or “Certification Error”: Some SPD Upgrade Tool versions require an authentication file for certain operations. This is usually included in the firmware package. Ensure you have extracted all files and, if prompted, point the tool to the auth.txt or similar file within the firmware folder.
Flashes Successfully But Won’t Boot: If the flash completes but the phone remains dead or stuck on a logo, first try entering recovery mode (Power + Volume Up) to perform a factory reset/wipe data. If that fails, ensure you are using the exact firmware for the “Access 50 Color 4G” model and not a similar variant, as this can cause a boot failure.
Phone Only Powers On When Connected to Charger: This can be a sign of a deeply discharged or faulty battery. However, if it started after a software issue, a full flash can help by recalibrating the battery driver and fuel gauge chip software. If the problem persists after a successful flash, the battery itself may need to be replaced.