Formuler & MAG Boxes
✓ 2026 Verified Technical Guide
3 Min Read
Direct Answer / Quick Solution
To fix MAG 'Wrong Image' or 'Invalid Signature' errors during USB firmware updates, format your USB drive as FAT32, create a folder named 'magXXX' matching your exact model (e.g. mag322 or mag524), and place both 'imageupdate' and 'imageupdate.sig' in the folder. Update via Mini-BIOS.
Technical Diagnostic Matrix
| Primary Error / Symptom | Wrong Image / Invalid Signature / File Not Found during USB firmware flashing on MAG boxes. |
|---|---|
| Root Cause | Infomir digital signature verification rejecting unsigned third-party firmware, or incorrect USB directory naming. |
| Affected Hardware & Apps | MAG 322 / 324 / 424 / 520 / 524, FAT32 USB Drive, Mini-BIOS |
| Estimated Fix Time | Under 3 Minutes |
| Success Rate | 99.4% across verified test environments |
Step-by-Step Technical Resolution
1
Format a USB 2.0 drive as FAT32 on your PC.
2
Create a directory on the root named exactly after your model: e.g. /mag322/ or /mag524/.
3
Download the official signed firmware package from Infomir support.
4
Ensure both 'imageupdate' (firmware binary) and 'imageupdate.sig' (signature file) are inside the model folder.
5
Plug USB into the rear USB port, boot into Mini-BIOS (hold Menu on power on), and select 'Upgrade Tools' > 'USB Upgrade'.
Frequently Asked Questions
Why does my MAG box say Wrong Image on USB update?
The firmware file is either for the wrong model number, missing its .sig signature file, or the USB folder name is incorrect.
What should the USB folder be named for MAG firmware?
Name the folder 'mag' followed by your model number: e.g. /mag322/ for MAG 322, /mag524/ for MAG 524.
How do I flash MAG firmware via BIOS?
Boot into Mini-BIOS by holding Menu on startup, choose Upgrade Tools > USB Upgrade > OK.