Arduino UNO R3 Mini/Micro USB ATmega328P CH340G

Most likely, wrong board selected is my guess. Link to product page and one of us can tell you what boards to try. Some ebay boards come with a bootloader that isnt the one youd expect.

Those blinkd after reset, is that the triple-blink of optiboot?

Get board info only works for boards with 16u2 as usb-serial interface or native usb, so thats fine.

Looks like driver is fine.

"Burn bootloader" requires you to have addional hartdware to work (specifically, it requires you to havr the isp programmer you selected from tools-> programmer connected to the target board)

Tools-> programmer setting doesnt matter unless you are using an isp programmer (for burn bootloader or upload using programmer)