# Controller Firmware Changelog
|  Version   |  Optimization Details   |  Update Date   |
| :---: | --- | :---: |
| KIDZBlocks_Master_V2.8.7 | Optimized the IDs of the Photoelectric Module and Light Sensor Module.<br/>Optimized the issue where some controllers could not power on properly | 2026.3.20 |
| KIDZBlocks_Master_V2.8.6 | Fixed an issue where the program was accidentally erased while the controller was running a program, causing the controller to become unusable.   | 2025.12.28 |
| KIDZBlocks_Master_V2.8.5 |  Fixed logic issues in Offline Mode introduced after version 2.8.0.   | 2025.05.22 |
| KIDZBlocks_Master_V2.8.4 |  Fixed the distance ratio issue in Calibration Mode between one-step and two-step calibration distances.   | 2025.02.15 |
| KIDZBlocks_Master_V2.8.2 | Added Bluetooth device name customization. The default Bluetooth name is `Blocks_Master`.<br/>Optimized the serial port data reception method. | 2024.10.12 |