How to update the firmware for RETRO NANO:

https://www.fiio.com/newsinfo/998824.html

The following changes and improvements have been made to the V6.3:

1.Added pet-themed UI

2.Added two preset EQ options for sibilance attenuation 1/2

V6.3 Firmware download link: Click here

Updated at 2026-01-05

The following changes and improvements have been made to the V6.0:

1. Added DRE control switch;

2. Fixed the popping sound issue when receiving phone calls after adjusting channel balance;

3. Optimized Bluetooth multipoint function.

1.新增DRE控制开关

2.修复调节声道平衡后，接听电话铃声会爆音问题

3.优化蓝牙一拖二功能

V6.0 Firmware download link: Click here

Updated at 2025-06-18

The following changes and improvements have been made to the V5.9:

1. Add power-saving shutdown function  

2. Optimize the noise issue when adjusting volume  

3. Optimize the issue of failed full charging with probability

4. Optimize the Bluetooth dual-device connection function

1.新增省电关机功能

2.优化加减音量有杂音问题

3.优化有概率无法充满电问题

4.优化蓝牙一拖二功能

V5.9 Firmware download link: Click here