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Credit facilities (Details 1) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]    
long-term bank loans $ 826,822  
Weizhong Bank [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 10.44%  
long-term bank loans $ 275,607  
Bankof Chengdus [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 4.00%  
Bankof Chengdu [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 3.60% 4.00%
long-term bank loans $ 551,215 $ 569,995
Huaneng Guicheng Trust [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 10.44%  
long-term bank loans $ 137,804