I recently purchased M6 Mark II from eBay store in Japan. The Camera was/is "Like New" and operates flawlessly.
However... I have been trying to pair my BR-E1 Remote and have had trouble. I thought it may be a Firmware issue so I looked for an up...
The instructions are in English. See images attached. You will see the cameras says "Memory card containing firmware in requires to update". The FIR file is on the Memory Card and in the camera, but it does not appear to recognize the file.