2.4.25(b25081301)
1. Fixed the issues in Output Settings:
 - 4mA and 20mA were disabled when the scaling type was Variable.
 - Pulse per unit and Device address values were incorrectly restored after a successful save

2.4.24(b25080701)
1. Resolved an issue where selecting 'L/min' as the flow unit had no effect on the real gas calibration curve.
2. Improved the unit settings based on relationships.
3. Resolved an issue that caused the gas factor to change to 1 unexpectedly.
4. Fixed an issue where the Calibration page appeared blank on S401 and S430 devices.

2.4.23(b25080501)
1. Zero Flow Calibration, Zero Pressure Calibration, and Cut-off settings are available to Ordinary Users.
2. Improved the unit settings based on relationships.

2.4.22(b25072501)
1. Disabled the Cutoff Threshold input field and switch for Ordinary Users.

S4C-FS 2.4.21(b25070901)
1. Fixed an issue where device ID 0x1218 was incorrectly identified as S451 on the app side. It now correctly maps to S418.
NOTES: This issue has always been present since earlier versions and was only identified recently.

S4C-FS 2.4.20(b25061101)
1. Fixed an issue with setting the analog scaling type（for all devices except S451 and S453）.

Note: Regardless of whether "0...max" or "Variable" is selected, the app always sends 0x02 to the firmware. on the app side, the selection is determined by comparing "Scale High" with "Max Flow":
 - If they are equal, "0...max" is selected.
 - Otherwise, "Variable" is selected.



2.4.19(b25060501)
1. Fixed an issue where the maxximum flow was not read when selecting "0...max flow" 
on the S418-V.
Note: Due to changes required by Google Play, the app ID has been updated. 
After installing the latest version, you will need to scan the QR code again.

S4C-FS 2.4.18(b25052901)
1. [Limitation] User calibration is not available when using flow units kg/s, kg/h, kg/min, lb/h, or t/h.
2. Fixed a bug that caused an error popup when tapping the “Logger settings” option.

S4C-FS 2.4.18(b25052601)
1. Fixed the issue where absloute pressure could not be read.

S4C-FS 2.4.18(b25052301)
1. Added support for reading absloute pressure from S451-V and S453-V.

S4C-FS 2.4.18(b25052201)
1. S451/453 vacuum version show the units as follows:
Flow: m3/h, l/min, m3/min, cfm
Pressure: bar(a), kPa(a), psi(a)

S4C-FS 2.4.17(b25051501)
1. Fixed the connection issue with S418-V

S4C-FS 2.4.16(b25040801)
1. Added the new device ids:
 - S415: S415 DN40(0x1229), S415 DN50(0x122A)
 - S418: S418 DN40(0x122B), S418 DN50(0x122C), S418-V DN40(0x122D), S418-V DN50(0x122E)

S4C-FS 2.4.15(b25040303)
1. Display the correct app name: S4C-FS.

S4C-FS 2.4.15(b25040302)
1. Fixed the issue where saving Output Settings for S451 failed when Alarm was enabled.

S4C-FS 2.4.15(b25040301)
1. Supports the S451 & S453 vacuum versions.
2. In the Output Settings, FAD and DryAir cannot be selected when the gas type is not Air.
3. Fixed the issue that "0...max" can't be saved.

S4C-FS 2.4.14(b25031401)
1. Fixed the issues of Output Settings for S402 NXP and S430.

S4C-FS 2.4.13(b25031101)
1. Fixed the issue with S402 Modbus Output settings.
2. Fixed the issue with temperature and pressure display in View Graph.

S4C-FS 2.4.12(b25030701)
1. Fixed the connection issue with S418.
2. Fixed the connection issue with S430.
3. Fixed the issue with S451/453 line chart display.
4. Removed Flow(R) and Velocity(R) from the View Graph menu for S453.

S4C-FS 2.4.11(b25030401)
1. Made S418 NXP work.
2. Fixed the TCP issues.
3. Fixed the issue of reading maximum and minimum Flow values.
4. Fixed the issue of overlapping text on the x-axis in the consumption chart for S451/453.
5. Fixed the issues of Units Settings for S451/453.
6. Displayed a massge to the user when the logger is running in Units Settings.

S4C-FS 2.4.10(b25022601)
1. Ordinary users can access the logger settings for S418.

S4C-FS 2.4.9(b25022501)
1. Fixed the issue where scanning the QR code of an ordinary user failed.
2. Fixed the issue where the device could not be connected (Bluetooth connection was not released).
3. Fixed the issue where a blank page appeared after saving Flow Settings.
4. Fixed the issue where a warning popup appeared after saving Unit Settings.
Note: These issues occurred on both iOS and Android.

S4C-FS 2.4.8(b25022001)
1. Fixed the Analog settings issues for S421 S415 S418 S401 S451.
2. Fixed some channels missing in online for S451.

S4C-FS 2.4.7(b25021801)
1. Fixed the issue where the 418 flow range was not displayed.
2. Fixed the issue where the 418 output settings was blank.

S4C-FS 2.4.6(b25021701)
1. Fixed the ethernet issue for S401.


S4C-FS 2.4.5(b25021401)
1. Fixed the connection issues for 415, 418, and 402.
2. Fixed the issue where the cut-off selector was not fully displayed.


S4C-FS 2.4.4(b25012301)
1. Upgraded to the latest Flutter version (3.27) to make the app ready for publishing on the App Store and Google Play.
2. Upgraded the app's Bluetooth driver.
3. Updated the UI to be compatible with Flutter 3.27.
4. Modified selection lists to dropdown buttons, such as in the Units settings.
5. Fixed the issue of missing decimal points when entering numbers on iOS.

S4C-FS 2.4.3(b24121801)
1. The ordinary user with setting permission can access the logger settings.
2. The super user can access the logger settings and logger settings.

S4C-FS 2.4.2(b24121701)
1. Fixed the missing pressure unit setting issue on the S418-V.
2. Fixed the missing logger settings issue on the S418-V.
3. Enabled the cutoff flow functionality for the S402.
4. The ordinary user with setting permission can access the alarm settings.


S4C-FS 2.4.1(b24121101)
1. Confirmed that S418 has pressure unit settings.
2. Fixed the issue that S418 has no Logger setting.
3. Improved the style of channel selection in Online.


S4C-FS 2.4.0(b24120601)
1. Fixed the issue that the units could not be modified for devices other than S451/453.
2. Resolved the numerical precision issue in Reference Conditions.
3. Fixed the synchronization issue in Units Settings.
4. Fixed the issue of error message popping up in Calibration

S4C-FS 2.3.15(b24112201):
1. When the firmware version is lower than 1.8, an attention message pops up.

S4C-FS 2.3.14(b24112101):
1. For S453, removed reverse column from the table[Consumption Chart].
2. Updated the pup-up content base on TF's suggestion[Logger Readout].

S4C-FS 2.3.13(b24111901)
1.Fixed the issue where the line chart display did not match the data.

S4C-FS 2.3.12(b24111401)
1. Fixed the issue with displaying tips for incorrect time period.

S4C-FS 2.3.11(b24111301)
1. Optimized the time selector of the time period.

S4C-FS 2.3.10(b24111201)
1. Fixed the issue where the Time Period was incorrect when entering time using the keyboard.
2. Fixed the issue that Flow(R) and Velocity(R) were not displayed correctly in the line chart.
3. Added the restriction that settings cannot be changed while the logger is running.
4. Implemented functionality to capture and ignore incorrect timestamps in the data list returned by the FW.

S4C-FS 2.3.9(b24110601) 
1. Improved the pop-up window
2. Fixed the issue of scanning QRcode.


S4C-FS 2.3.8(b24110501) 
1. For the segmented loggers, pop up an information window for the user
2. Fixed the issues of Unit Settings.
3. Removed the Records number of the Logger readout.


S4C-FS 2.3.7(b24102801)
1. Improved the logger readout(pop up the message on App GUI).
2. Improved the layout and display of the Consumption Graph.


S4C-FS 2.3.6(b24102301)
1. Improved the logger readout(read records until the first stop happened and inform the user).
2. Improved the layout and display of the Consumption Graph.


S4C-FS 2.3.5(b24101201)
1. Improved logger readout
2. Improved graphs (Y axis)


S4C-FS 2.3.4(b24093001)
1. csd file support(read via S4A).
2. Fixed the issues of User Calibration.

S4C-FS 2.3.3(b24091401)
1. Added (g) for pressure unit.
2. Fixed the error data when reading logger.[Logger readout]

S4C-FS 2.2.7(b24082701)
1. Removed "Steam" from gas type for S453.
2. Removed validation for variable flow range.
3. Fixed the issues of Modbus/Baudrate.
4. When "O must pair 1" pops up, "SUCCESS" will no longer pop up.


S4C-FS 2.2.6(b24082301)
1. Fixed the issues of Analog settings.
 - Unit conversion.
 - 4mA and 20mA range prompt pop-up
 - Removed 1200 from Baudrate list

S4C-FS 2.2.5(b24082101)
1. Fixed the issues of Analog settings.

S4C-FS 2.2.4(b24081301)
1. Fixed the issues of Output settings.
2. Fixed the issues of Gas type selection.
3. Fixed the issues of User slope.
4. Fixed the issues of Sensor Info.
5. Fixed the issues of Consumption having no data.
6. Multi-language support.

v2.2.1(b24080501)
1. Fixed the issues related to Gas type selection.
2. Fixed the issues where the top bar[Online] does not display progress.
3. Multi-language support.
4. Optimized App UI/UX

S4C-FS 2.2.0(b24071801) Updates (only for S453) :
1. Removed Velocity(R), Flow(R) from channel selection list. [Alarm Settings]
2. Fixed the issues of Zero Flow Calibration.
3. Fixed the issues of Zero Pressure Calibration.
4. Fixed the issues of Sensor Info.
5. Display the icon button which is used to callout Consumption graph.
6. Fixed the issue that the Modbus Settings could not be saved.


S4C-FS 2.1.23(b24071501) Updates (only for S453):
1. Fixed the issues of Consumption. [Online]
2. Fixed the issue with failing to save Flow settings. [Flow Settings]
3. Fixed the issue with failing to save Flow and Consumption units. [Units Settings]
4. Completed the settings of Analog1 and Analog2. [Output Settings]


S4C-FS 2.1.22(b24070201) Updates (only for S453):
1.  Fixed the issue with the Settings menu itmes
2.  Improved the Flow Settings:
      - Pipe diameter is read-only.
      - Removed the Sensor Installation depth.

S4C-FS 2.1.21(b24062802) Updates:
1.  Supports S453

S4C-FS 2.1.19(b24062701) Updates:
1.  Supports S453(just copied the functionality of S453)

S4C-FS 2.1.18(b24062601) Updates:
1. All functions provided by Neo.
2. Merged the fixed User slope.


S4C-FS 2.1.17(b24061201KR)  Updates:
1. Removed Variable pressure.

S4C-FS 2.1.16(b24060601KR)  Updates:
1. Output setting_ Analog 1, Analog 2, pulse
