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VTX & FC Firmware

Walksnail Ascent VTX system latest firmware V18.21.10

Downloads in VTX & flight-controller firmware, grouped by device and use.

V18.21.10 (2026-08)

New Features

1. Added support for Ascent Lite+ air unit.

2. Added support for Ascent VRX Pro receiver.

3–6. Added audio transmission/recording and high-frame-rate recording (with compatible air/ground hardware).

7. Displays device info in Chinese when Chinese UI mode is selected.

8. Air unit supports voltage-based RF switching and USB-powered firmware upgrades.

9. Ground unit boosts output by +3dB in low-latency mode with a single-antenna air unit.

Fixes & Improvements:

1. Fixed abnormal spectrum-scan info display on the air unit.

2. Improved bitrate stability in 100fps mode.

3. Smoothed wireless timestamp synchronization between air and ground units for steadier 100fps frame pacing.

4. Reduced latency in high-frame-rate mode.

5. Fixed incorrect playback button state after playback finishes.

6. Fixed file search failure when recorded video playback exceeds 30 minutes.

7. Disabled daemon log output to reduce repeated NAND flash writes and prevent potential bricking.

8. Ground unit shows the quick-start guide on first boot after factory reset.

9. Fixed abnormal power setting after air unit exits low-power mode.

10. Fixed video corruption when VRX Pro connects to Avatar X at 1080p 100fps.

11. General system optimizations and known bug fixes.