WF-1000XM4 update issue "the battery level is insufficient. charge the mobile device and try again."

If you are looking into this matter, then you probably already have your WF-1000XM4 100% charged. By the way, is your smartphone fully charged? In my case, it needed to be charged to at least 35%.

ソニー ワイヤレスノイズキャンセリングイヤホン WF-1000XM4 : 完全ワイヤレス/Amazon Alexa搭載/Bluetooth/LDAC対応/ハイレゾ相当 最大8時間連続再生/高精度通話品質/IPX4防滴性能/ ワイヤレス充電対応/2021年モデル / マイク付き/マルチポイント対応 360 Reality Audio認定モデル ブラック WF-1000XM4 BM