[Amazfit] madtech360:
Here is list of change log. There are more releases between 0.9.50 and 1.2.5a. Not sure if there is a way to get those change logs or if someone cares :D

1.0.2 Update Log

- Optimize the heart rate algorithm

- Optimize the GPS algorithm

- Added alarm application

- Add independent music applications

- Increase the standby mode of 3 dials

- Number of steps to access micro letter list

- Improve system stability

- fix some bugs

1.1.3a Update Log

- Added "future weather" function

- Added millet phone unlock support

- New sports lock screen can be customized 4 or 6 data

- Double-click the dial unlock switch

- Added headset connection status icon

- Added support for connection to hide WIFI function

- Optimize power consumption issues

- Optimize the brightness of the screen after the wrist

- Improve system stability

- fix some bugs

1.1.6a Update Log

- "Heart rate" application

- Added "all-day heart rate" mode

- Added watch wear monitoring

- Added movement to wear too loose prompt

- optimized GPS algorithm

- Optimize watch power consumption

- Optimize consumption algorithms

- Improve system stability

- Fix several bugs

1.2.2a Update Log

- Added "City Elite" and "Phantom Camouflage" 2 dials

- Optimization Alipay bar code interface

- Optimize Bluetooth connectivity issues

- Optimize data synchronization issues

- Optimized sleep algorithm

- Optimize power consumption issues

- fix some bugs

1.2.3 Update Log

- Added "2017" dial

- Added dial background custom function

- Optimize watch upgrade notification

- Optimize watch power consumption

- fix some bugs

1.2.5a Update Log (Pre-Release)

- Add "timeless moment" dial

- Dial support background image deleted

- dial support pointer, dial scale replacement

- Added "training center" function

- new lock screen under the long notice turn the wrist flip page

- New micro letter red envelope reminder notice

- Optimize data synchronization recommended upgrade to 1.2.0 version of Huami watch App)

- fix some bugs

1.2.6a Update Log (Part of Release 1)

- update the GPS firmware

- new "Golden Rooster newspaper" dial

- new support to replace the dial data item

- new dial background Contest Top5 background

- Optimize the "Eternal Moment" dial interface

- Optimize data synchronization (recommended upgrade to 1.2.1 version of Huami Watch App)

- Add Alipay, QQ Red Packet Reminder (Android phone only)

- Optimize system stability

- Fix bugs

1.2.6b Update Log (Part of Release 1)

- further optimize system stability and power consumption

1.2.6c Update Log (Release 1)

-repair running lock screen interface stride frequency error problem

1.2.7 Update Log (Release 2)

- add a new custom dial date item hidden;

-new walking step data item

-new clear all the notification function (long press a single Notification)

- optimize the movement lock screen interface black and white problem

- optimize data synchronization

- fix a number of bug

1.2.8 Update Log (Release 3)

- New Sports Weekly (9 pm every Monday)

- add long long time to sit to watch the fitness video news (only android, need to install Mi fit sports App)

- Optimized exercise heart rate algorithm

- Optimized running step frequency algorithm

- Optimized sleep resting heart rate algorithm

- Optimize overall stability

- Bug Fixes

1.2.9 Update Log (Release 4)

- add riding mode add "accumulated downhill elevation"

- optimize system status menu

- optimize notification icon display

- repair iOS some situation can not be received to the question of the notification

- fix the problem of repeatedly downloading the motion data

- fix the heart rate history data does not show the problem

- fix some bugs

1.2.10 Update Log (Release 5)

- Update GPS firmware

- Add elliptical motion mode

- Add automatic flight mode

- Optimize system settings menu arrangement

- Optimize Bluetooth stability

- Fixed several bugs

1.2.11 Update Log (Release 6)

- add 12/24 hours unit switch

- new metric / imperial unit switch

- add user-made pointer dial function, tutorial see Huami Forum