OTA Upgrade Instructions for Poseidon M300

Two upgrade methods are available. Either method must be completed within 15 minutes.

Method 1: APP OTA Upgrade

• In the APP, tap “Upgrade Now”
• The display will first show “UP--” for 3 seconds, then show the progress dynamically from 0 to 100
• After the upgrade is completed, the device will automatically enter standby mode.

Method 2: USB Drive Upgrade

• Name the upgrade file U382A.bin and place it in the root directory of a FAT32‑formatted USB drive (single file only)
• With the main unit powered on, insert the USB drive, then press and hold the “Gain Type” button for 5 seconds to start the upgrade.
• The display will show “UP--” for 3 seconds, then show progress from 0 to 100. After completion, the device will automatically enter standby mode.

Notes:

• Before upgrading, confirm that the subwoofer and all 4 surround speakers have been successfully paired with the soundbar
• If the system is under heavy loading, the display may show “LOAD” (for about 30 seconds), and the APP will prompt “Restarting, please wait patiently.
• OTA packages cannot be used across different models.