The new firmware is suitable for FI9803EP,FI9803P,FI9853EP,FI9851P,FI9821P V2,FI9826P V2,FI9831P V2,FI9821EP

System firmware version: 1.5.3.19
App firmware version: 2.x.2.31
Plug-in version: 3.3.0.31

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Improvements:
1. Fixed alarm snapshot interval issues.
2. Fixed some bugs.
