Update 3.Maintenance_and_Logs_Guide.md

docs/3.Maintenance_and_Logs_Guide.md

@@ -44,21 +44,22 @@ Starting from version V2.5, a simple logging system has been introduced to help
 
 ### System Log `sys_log.txt`
 
-This log file is viewable on a computer. You can customize the log's storage location using the built-in `logs_save()` function. When the log file reaches 100KB, the system will automatically rename and overwrite it.
-
-**Format:**
-```
-Triggered function: Total tension count / Custom information
-```
+System logs are used to record key information and error messages during system operation, making it easier for future diagnostics and maintenance. They can be viewed on a computer, and starting from version v2.72, they can also be viewed through the Boot Mode Selector. When the log file reaches 100KB, the system will automatically rename and overwrite it.
 
 **Example:**
+
+The following is an error message captured during system operation. This error was caused by an unstable LCD, which led to a system crash. The system used try-except to capture this rare exception and recorded it in sys_log.txt, thereby improving debugging efficiency.
+
 ```
-init(HX711):55863T/21188/21465/401/90
-forward():55863T/No String?
-start_tensioning():55863T/ts_err#0
-forward():55863T/No String?
-start_tensioning():55863T/ts_err#0
-init(HX711):55863T/21188/21493/487/90
+start_tensioning():4927T/[Errno 110] ETIMEDOUT / MEM: 127376 bytes
+Traceback (most recent call last):
+    File "main.py", line 679, in start_tensioning
+    File "main.py", line 392, in lcd_putstr
+    File "src/lcd_api.py", line 154, in putstr
+    File "src/lcd_api.py", line 140, in putchar
+    File "src/pico_i2c_lcd.py", line 87, in hal_write_data
+OSError: [Errno 110] ETIMEDOUT
+
 ```
 
 ### Stringing Log `logs.txt`
@@ -97,4 +98,17 @@ Reliability test count / Total tension count / Automatic tension parameter / Tes
 4524/60387T/1.04/0.97/13
 4525/60388T/1.03/0.97/12
 4526/60389T/1.04/0.97/13
-```
+```
+
+## Boot Mode Selector
+
+Starting from version V2.72, the system has introduced a Boot Mode Selector, allowing users to quickly enter specific modes by holding different keys during startup. This makes system maintenance, upgrades, and testing more convenient.
+
+ - By pressing and holding specific keys, then powering on, you can now enter different modes:
+   - Up Key: Enters Reliability Testing mode
+   - Down Key: Enters Software Update mode
+   - Middle Key: Enters Hardware Function Testing mode
+   - Right Key: Displays system logs (`sys_log.txt`)
+   - Exit Key: Performs a Factory Reset
+
+Note: Do not release the keys until you see the mode displayed on the LCD screen.