固件升级提醒：
1.解压文件，将HIFIECXX.img文件拷入ECHO MINI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 HIFIEC25.img file to the root directory of the ECHO MINI'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. 

-----V3.4.0-------
1.新增短控切曲按键模式
2.优化电量显示准度
3.其它系统优化
注：
按键模式A：短按调节音量，长按快进快退，双击切曲；
按键模式B：短按切曲，长按快进快退，双击调节音量；
1. Added new button mode for track control.
2. Improved battery level display accuracy.
3. Other system optimizations.
Note: 
Button Mode A: Short press to adjust volume, long press to fast forward/rewind, double press to switch tracks. 
Button Mode B: Short press to switch tracks, long press to fast forward/rewind, double press to adjust volume.

-----V3.3.0-------
1.新增DSD格式的ID3信息显示
注：DFF格式不支持ID3信息显示
2.修复更新媒体库有概率出现“我喜欢”被清空的问题
3.其它系统优化
1. Added support for displaying ID3 tags for DSD format.
Note: DFF format does not support ID3 tag display.
2. Fixed an issue where updating the Media Library would accidentally clear Favorites.
3. Other system optimizations.

----V3.2.0-------
1.修复点击播放歌曲的时候有概率会出现跳曲的问题
2.优化优化第4、5级音量顺滑度
3.其他系统优化
1. Fixed the issue where clicking to play a song might occasionally cause song skipping.
2. Optimized the smoothness of level-4 and level-5 volume.
3. Other system optimizations.

-----V3.1.0-------
1.新增流派分类支持播放所有歌曲。
2.修改设置定时关机后操作按键不再重新计时。
3.其他系统优化。

------V3.0.0------
1.新增长按菜单键快速添加/取消【我的最爱】功能。
2.新增在熄屏状态也支持快进快退操作。
3.修改主页原【播放列表】名称为【媒体库】。
4.其他系统优化。

1. Added the function of long pressing the menu button to quickly add/remove songs from the Favorites list.
2. Added support for fast-forward/rewind operations when the screen is off.
3. Renamed the original Playlist section on the home screen to Media Library.
4. Other system optimizations.

------V2.8.0------
1.新增歌词开关。
2.新增声道平衡调节。
3.修复更换盘符后会清空收藏夹歌曲的问题。
4.修复更新媒体库有概率出现死机的问题。
5.优化歌曲导航速度。
6.其他系统优化。

-----2.8.0------
1. Added lyrics display switch.
2. Added channel balance adjustment.
3. Fixed an issue where changing the drive letter would clear the favorites list.
4. Fixed a rare crash issue when updating the media library.
5. Optimized song navigation speed.
6. Miscellaneous system optimizations.


------V2.7.0------
1.新增音量按键调换功能。
2.修复切曲有概率出现封面不显示的情况。
3.其他系统优化。

------V2.7.0------
1. Added a function of swapping volume buttons.
2. Fixed the issue where the album cover might not be displayed when switching tracks.
3. Miscellaneous system improvements.


------V2.6.0------
1.修复M4A格式专辑排序乱序的问题。
2.优化兼容支持RIFF格式ID3信息显示。
3.其他系统优化。

------V2.6.0------
1. Fixed the issue of incorrect album sorting for M4A format files.
2. Optimized compatibility to support displaying ID3 information in RIFF format.
3. Other system optimizations.


------V2.5.0------
1.修复有概率出现杂音的问题。
2.优化随机播放逻辑。
3.优化内存容量显示逻辑。
4.其他系统优化。

------V2.5.0------
1.Fixed the noise problem that occurs occasionally;
2.Optimized the shuffle playback logic;
3.Optimized the flash memory capacity display logic;
4.Miscellaneous system improvements.


------V2.4.0------
1.新增USB DAC功能。
2.新增文件夹跳曲功能。
3.优化DAC DRE参数。
4.其他系统优化。

提示：
1.由于更新内容较大，固件升级会先格式化本机内存，建议升级固件前备份好歌曲；
2.USB DAC功能，是指可以将ECHO MINI连接手机或电脑，作为USB解码耳放使用；
3.使用电脑或手机OTG连接ECHO MINI即会自动弹出USB DAC和数据连接选择项，选择后会记忆默认；
4..USB DAC功能无需安装驱动，免驱使用，支持48kHz采样率，暂不支持独占使用；
5.使用USB DAC功能时，手机或电脑会对ECHO MINI充电，建议连接手机时，充满电再使用。

------V2.4.0------
1. Added USB DAC function.
2. Added folder skip function.
3. Optimized DAC DRE parameters.
4. Other system optimizations.

Notes:
1. Since the update is extensive, the firmware upgrade will first format the internal memory. It is recommended to back up your songs before upgrading.
2. The USB DAC function allows the ECHO MINI to be connected to a smartphone or computer and used as a USB DAC and headphone amplifier.
3. When connected to a computer or smartphone via OTG, the ECHO MINI will automatically display a prompt to select between USB DAC mode or data transfer mode, and the selection will be remembered as default.
4. The USB DAC function is driver-free, which supports a 48kHz sampling rate, and currently does not support Exclusive USB Audio Access Mode.
5. When using the USB DAC function, the connected smartphone or computer will charge the ECHO MINI. So it is recommended to fully charge it before connecting to a smartphone.


--------V1.8.0固件-------
1.新增3款主题UI。
2.修复低亮度时屏幕闪烁的问题。
3.修复部分ID3信息在播放界面显示为未知的问题。
4.修复有概率出现升级闪退的问题。
5.修复部分歌曲出现掉字的问题。
6.优化部分语言翻译。
7.其他系统优化。

--- Firmware V1.8.0 ---
1. Added 3 new UI themes.
2. Fixed screen flickering at low brightness.
3. Fixed the issue where some ID3 tags displayed as unknown in the playback page.
4. Fixed random crashes during firmware updates.
5. Fixed character dropouts in certain tracks.
6. Optimized some language translations.
7. Other system optimizations.

---V1.7.0固件---
1.新增自定义EQ。
2.修改开机取消自动更新媒体库。
3.修复部分OGG格式不支持的问题。
4.优化部分特殊字符的显示。
5.优化封面歌词的显示。
6.其他一些系统优化。

--- Firmware V1.7.0 ---
1. Added custom EQ functionality.
2. Modified startup to cancel automatic media library updates.
3. Fixed support issues with some OGG formats.
4. Optimized display of certain special characters.
5. Optimized cover lyrics display.
6. Other system optimizations.

---V1.6.0固件---
1.修改艺术家显示优先单曲艺术家；
2.修复歌曲播放起始缺失掉字的问题；
3.优化随机播放规则；
4.优化专辑图片显示；
5.其他一些系统优化。
--- Firmware V1.6.0 ---
1. Modified artist display to prioritize track artists.
2. Fixed audio clipping issue at the beginning of track playback.
3. Improved shuffle play logic.
4. Optimized album art display.
5. Miscellaneous system optimizations.


---V1.5.0固件---
1.新增复古EQ；
2.修改关机LOGO显示字体;
3.修改艺术家分类优先专辑艺术家；
4.修复低亮度时切曲有屏幕闪烁问题；
5.优化随机播放规则，可记忆上一曲；
6.优化歌曲的ID3信息显示；
7.其他一些系统优化。
--- Firmware V1.5.0 ---
1. Added Retro EQ style;
2. Modified font display for shutdown logo;
3. Modified artist categorization to prioritize "Album Artist";
4. Fixed the screen flickering issue when switching tracks at low brightness;
5. Optimized shuffle algorithm to now remember previous track;
6. Optimized ID3 tag display for songs;
7. Miscellaneous system improvements.

 
---V1.4.6---
1.修改播放页齿轮为逆时针转动；
2.增加屏保时钟的设置功能；
3.修复亮屏时背光芯片有轻微啸叫声问题；
4.优化部分歌词库的读取显示；
5.优化播放列表页歌曲以文件名排序；
6.修改专辑列表歌曲以音轨号排序；
7.其他一些系统优化。
---V1.4.6---
1. Changed the playback page gear to rotate counterclockwise.
2. Added a setting function for the screensaver clock.
3. Fixed the issue where a slight whistling noise existed in the backlight chip when the screen was on.
4. Optimized the reading and display of certain lyrics libraries.
5. Optimized the sorting of songs in the playlist page by filename.
6. Changed the sorting of songs in the album list by track number.
7. Miscellaneous system improvements.

---V1.4.0---
1.增加封面显示和全屏歌词功能；
2.增加快进快退功能；
3.优化系统总音量级为120级；
4.文件浏览项增加"我喜欢"收藏保存功能；
5.修复关机时有概率出现"pop"声;
6.其他一些系统优化。
---V1.4.0---
1. Added cover display and full-screen lyrics function;
2. Added fast forward and backward function;
3. Optimized the total volume level of the system to 120;
4. Added “My Favorites”  song collection functionality in file browser option;
5. Fixed the the issue where there is a probability of having a “pop” sound when turning off the player;
6. Miscellaneous system improvements.

---V1.3.0---
1.歌曲名显示由文件名调整为ID3信息；
2.时钟显示由12小时制调整为24小时制；
3.改善播放歌曲开头“掉字”问题；
4.修复关机充电后有概率重新更新歌曲库；
5.改善“我喜欢”收藏保存功能；
6.其它一些系统优化。
---V1.3.0---
1.Adjusted song title display from filename to ID3 tags;
2.Changed clock display from 12-hour to 24-hour format;
3.Improved audio playback to prevent missing characters at the beginning of the song;
4.Fixed the issue where the music library may update if the device is charging while powered off;
5.Improved the functionality of song collection in "My Favorites";
6.Miscellaneous system improvements.

---V1.2.7---
1.优化歌曲文件排序；
2.修复时钟设置重启后有时会复位的问题；
3.修复关机充电时，“充电中”字符闪烁问题；
4.优化关机后再开机蓝牙回连功能。
---V1.2.7---
1. Optimized song file sorting.  
2. Fixed the issue where the clock setting sometimes reset after a reboot.  
3. Fixed the issue where the "Charging" characters would flash when charging the device during the power-off state. 
4. Optimized Bluetooth auto-reconnect function after shutdown and power-on.

---V1.2.5-----
1.增加增益设置（播放界面下按菜单键在播放设置菜单中设置）；
2.默认打开省电模式开关，默认为 “5分钟”；
3.修复滤波器设置关机后不保存的问题；
4.修复不能在文件夹内随机循环播放的问题；
5.改善概率性出现播放自动快进及杂音问题；
6.修复蓝牙播放有概率性爆音；
7.取消提示弹窗的“警告”符号。

--- V1.2.5---  
1. Added Gain settings (press the menu button in the playback interface to access and adjust it in the playback settings menu).  
2. The power-saving mode is enabled by default to 5 minutes. 
3. Fixed the issue where filter settings were not saved after shutdown.  
4. Fixed the issue where shuffle loop play within folders was not working. 
5. Fixed the issue where automatic fast-forwarding and noise may occur during playback.  
6. Fixed the issue of where popping sound may occur during Bluetooth playback.
7. Removed the "Warning" symbol from the pop-up prompt.