固件升级提醒：
1.解压文件，将NANOXX.IMG文件拷入ECHO NANO本机内存根目录，安全退出设备；
2.如机器有插TF卡，请先将TF卡取出，重启自动升级；
Firmware Upgrade Reminder:  
1. Unzip the file and copy the NANOXX.IMG file to the root directory of the ECHO NANO's internal memory. Safely eject the device and restart it to begin the automatic upgrade.  
2. If you encounter any issues, please feel free to contact us. 


---ECHO NANO V1.7.0---
1.优化歌曲ID3信息显示
2.其它系统优化
1. Optimized the display of ID3 tags.
2. Other system optimizations.

---ECHO NANO V1.6.0---
1.优化程序上电时序，提高系统稳定性。
1. Optimized the program's power-on sequence to improve system stability.

---ECHO NANO V1.5.0
1.修复OGG格式在切换上一曲时会提示不支持的问题
2.修复部分APE格式ID3信息不显示的问题
3.修复WMA格式ID3信息不显示的问题
4.其它系统优化
1. Fixed an issue where switching to the previous track would trigger an "unsupported format" error for OGG files.
2. Fixed an issue where ID3 tags were not displayed for some APE files.
3. Fixed an issue where ID3 tags were not displayed for WMA files.
5. Other system optimizations.


----ECHO NANO V1.4.0-----
1.修复充满电开机会出现电量变成三格的问题
2.优化上一曲切曲逻辑
3.优化更新媒体库加载速度
4.其它系统优化
注：
上一曲切曲逻辑：在当前曲目播放到3S以内时，切换上一曲会跳转到当前曲目的上一曲并开始播放；而当曲目播放超出3S后，切换上一曲则会跳转到当前曲目的0S开始重新播放。
1. Fixed an issue where the battery display would show only three bars after the device was fully charged and powered on.
2. Optimized the previous track switching logic.
3. Optimized the media library loading speed.
4. Other system optimizations.
Note:
Previous track switching logic: When the current track has played for less than 3 seconds, switching to previous track will skip to the actual previous track and start playback;
when the current track has played for more than 3 seconds, switching to previous track will restart the current track from the beginning (0:00).

----ECHO NANO V1.3.0-----
1.修复M4A格式专辑排序错乱的问题
2.修复随机播放模式下开机续播后出现固定顺序的问题
3.修复个别歌曲开机续播出现爆音的问题
4.修复切换盘符会出现清空TF卡收藏的问题
5.修复部分TF卡更新媒体库不成功的问题
6.优化设备充电时间，充电时间约2小时
7.其它系统优化
1. Fixed an issue where album sorting disorder occurred for certain formats.
2. Fixed an issue where playback would revert to a fixed sequence after resuming from startup while in shuffle play mode.
3. Fixed a popping sound issue when resuming certain songs from startup.
4. Fixed an issue where switching drives would clear Favorites stored on the microSD card.
5.Fixed an issue where Media Library could not be updated on some micro-SD cards.
6. Other system optimizations.

----ECHO NANO V1.2.0-----
1.新增专辑排序下的CD号排序
2.修复在”我喜欢“里播放时不能记忆续播的问题
3.修复进入“艺术家/流派”分类会显示乱码的问题
4.其它系统优化
注：
专辑排序：排序逻辑顺序为CD号--音轨号--文件名
----ECHO NANO V1.2.0-----
1. Added CD number sorting under “Album Sorting”.
2. Fixed the issue where playback progress was not retained when playing in “My Favorites”.
3. Fixed the issue where garbled characters appeared when entering the “Artist/Genre” category.
4. Other system optimizations
Note:
Album Sorting: The sorting order is CD number -- Track number -- File name

