DJI O4 & O4 Pro Stuck at 15Mbps Bitrate Issue Explained & Workaround - DJI Fix This!

Alex -

This article addresses a pressing issue with the DJI O4 system, which has left users grappling with a frustrating bitrate limitation. If you’re using the O4 Pro or Lite with DJI Goggles 2 or Integra, this is a must-read.

TL;DR

The DJI O4 system has a known issue where users experience a bitrate cap of 15 Mbps when using the ham file with DJI Goggles 2 or Integra. While there's no permanent fix, users can employ workarounds like resetting the system or switching to manual channel mode to regain functionality.

Understanding the Bitrate Limitation

Users have reported that both the O4 Pro and Lite encounter limitations when paired with the DJI Goggles 2 and Integra. The ham file, which is designed to enable FCC-level RF output and additional manual channels, is at the heart of the issue. Essentially, it limits the available bitrate to either 16 or 31 Mbps, which is far below expectations.

The Ham File: What Is It?

The ham file—specifically named ham_cfg_support—is a workaround for users wanting FCC performance in CE areas. This file allows users to access more channels and higher RF output, but it comes with its own set of problems. When using this file, users often experience a maximum bitrate that’s nowhere near the expected 50 Mbps for the O4 system.

The Impact on Users

While the O4 system is supposed to dynamically adjust bitrate based on signal quality, users have reported that, with the ham file, they’re stuck around 15 to 31 Mbps. This is a significant drop from the expected performance, leading to frustration among drone enthusiasts.

Demonstrating the Issue

In a practical demonstration, the disparity in expected versus actual performance was highlighted. In low power mode, the bitrate dropped to 1 Mbps when disarmed. Once armed, it should jump to 50 Mbps, but users have seen it only reach 14-15 Mbps.

Current Workarounds

While there is no permanent fix, there are a few workarounds to improve the situation:

  • Resetting the DJI Goggles and ear unit can help restore normal functionality.
  • Switching to manual channel mode can override the auto settings and potentially restore proper bitrate.
  • Adjusting bandwidth settings can also yield better performance.

Resetting Your DJI Goggles

To reset your DJI Goggles, navigate to the settings menu, select “About,” and scroll down to “Reset All.” This action will erase any changes made by the ham file, allowing the system to revert to its normal operating mode.

Removing the Ham File

Before performing the reset, ensure that the SD card is removed or formatted. If the ham file remains on the SD card during reboot, the same issues will persist. After resetting, users can operate the system without the ham file, albeit with reduced RF power and fewer channels.

Manual Channel Mode: Pros and Cons

For those who want to retain the ham file benefits while achieving better performance, manual channel mode is an option. This setting allows users to select their bandwidth manually, potentially restoring the maximum bitrate. However, it comes at the cost of losing auto functionality, which can be risky in areas with variable signal quality.

Dynamic Bandwidth Levels

A peculiar quirk of the ham file issue is that the bandwidth levels do not adjust dynamically as they should. Users find themselves stuck on lower bandwidth modes unless they make manual adjustments. This inconsistency can lead to further complications, especially in challenging environments.

The Long-Term Outlook

Given that this issue stems from an unofficially supported feature, it’s unlikely that DJI will provide a fix. Users should be prepared to deal with these limitations, and many have found the only reliable solution is to invest in the newer DJI Goggles 3 for optimal performance.

Takeaway Box

  • DJI O4 users are experiencing significant bitrate limitations when using the ham file.
  • Resetting your goggles can restore original functionality without the ham file.
  • Manual channel mode can improve performance but sacrifices automatic adjustments.
  • Expect no official fix from DJI, as this issue is tied to an unsupported feature.
  • For maximum performance, consider upgrading to DJI Goggles 3.

While the DJI O4 system offers impressive capabilities, users are currently facing significant challenges when using the ham file with specific goggles. Until DJI addresses these issues—or until users upgrade to newer models—workarounds will be essential for maintaining optimal performance.

Let us know your thoughts in the comments. Stay safe, and happy flying!

This article was based from the video DJI O4 & O4 Pro Stuck At 15Mbps Bitrate Issue Explained & Workaround - DJI Fix This!