2023/0707          V20
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修复问题：
1：能够看到方波上升下降的垂直线
2：修改了垂直电压光标测量的名称
3：修复开机语言
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Fix issues:
1: When measuring a square wave, you can see the rising and falling vertical lines.
2: Modify the name of the vertical voltage cursor measurement
3: Modified the text of the switching language interface.
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2023/07/24          V30
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修复3点：
1：信号发生器频率问题
2：个别固件升级变砖问题
3：暂停后只显示单帧波形，便于分析协议
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Fix the problem:
1: Signal generator frequency problem
2: Some devices cannot be turned on after firmware upgrade
3: After pausing, only a single frame waveform is displayed, which is convenient for analyzing the protocol
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2023/09/27          V40
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修复内容：
1：波形更细，更清晰，降低了波形粗细
2：方波垂直线更亮，更明显
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Fixes:
1: The thickness of the waveform is reduced, making the waveform thinner and clearer.
2: The vertical lines of the square wave are brighter and more obvious
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Upgrade steps:
1: Open the settings menu and turn on USB sharing.
2: Use the data cable to connect to the computer,
3: At this time, the computer will pop up a U disk, and directly pull the firmware to the U disk.
4: Click the device's shutdown button, then restart it, and wait for the firmware upgrade to complete before it can work normally.