Verify the file size (typically around to 8MB for these models).
Copy the S4040_V113_CHMAX.bin file to the root directory of the USB drive. Download S4040 V113 CHMAX bin
Look for reputable satellite support communities or official Senator/CHMAX manufacturer sites . 3. Installation Steps Format USB: Use a USB flash drive formatted to FAT32 . Verify the file size (typically around to 8MB