Xiaomi Buds 3T Pro: Partly bricked? How to force install firmware via USB?

[haxxblaster]

My Xiaomi Buds 3T Pro can only connect to the right earbud.


Facts:

• Both earbuds worked a few days ago (they are brand new and have only been used a few times)
• No information about the buds are displayed in the Mi buds M8 app (but they are recognized)
• Holding in the case button for 2 seconds to connect or 10 seconds to factory reset only works when the right earbud is in the case alone, with both in it does not connect or factory reset
• Using Mi buds M8 app to install a firmware results in "Connect device" when

My guess:

• An automatic firmware update has failed for some reason
• Installing firmware via USB cable from my computer to the ear buds could work

How can you help me?

• Suggest ways of how to install the firmware from my Mac to the buds via USB (software suggestion)
• Any other idea that could resolve the issue

Thanks in advance