Hi have a Win11 machine , IDE 1.8.19 .
If I select UNO as the board type , USBtinyISP as the programmer and then load bootloader everything works fine .
If I select minicore AVR , 328 etc and USBtinyISP , I get the orange message ( paraphrase)
USBTiny found
USB permission denied
Error loading bootloader .
I can’t seem to find the issue , user account with admin authority , Any ideas ?
The reason you are getting different results when the Uno board is selected in Arduino IDE is because MiniCore uses a different version and build of AVRDUDE.
I think you can use the technique described here in the AVRDUDE wiki to fix the problem: