I've just tried, it doesn't workI think it's not writing to flash, because the values in the 'Basic' tab are not permissible. All the values on your video in the 'Current Limit[%]' are zero
As a test, try writing the 'Current Limit[%]' to 100% in each of the 'Assist Levels 0-9'. Then in the 'Speed Limit[%]' write 10% in 'Assist Level 0', 20% in 'Assist Level 1', 30% in 'Assist Level 2' and so on up to 100% in 'Assist Level 9'. You must change all these values first before writing to flash, NOT one at a time! Also, write to flash only using the write to flash on the left hand side.
When I press read, nothing happens.