Please understand that I translated the article from Korean to English using a translator. 

 I am currently living in Korea. 

While I was using this 1.74 firmware, at some point, only the L side unit was recognized in the cradle, but the R was recognized in the cell phone and app, but a symptom occurred where charging did not work. 

 This symptom occurs when the unit's battery is below 70%.

 However, when the unit is placed in the cradle and charged, both L and R are recognized, and when initialized later, it operates normally, causing inconvenience in use. 

 There was no improvement even after wiping the magnet area with an alcohol swab. After slightly moving the memory silicon of the R side unit, I looked at the indicator light and it was recognized, so I took advantage of this gap and downgraded to 1.5. In state 1.5, this series of symptoms does not occur, and even if you try to reproduce the symptoms by touching the unit, the symptoms do not occur. 

 Please improve this problem when the firmware is updated in the future.