Cannot install new firmware 0.5.1

Hi Friend,

Thanks for choosing EarFun. Sorry for the inconvenience caused to you.

Please send your order number and the screenshot of the error to our customer service team via service@myearfun.com or submit the warranty ticket on our official website: https://www.myearfun.com/process-warranty. EarFun provides an 18-month warranty for every product. Your satisfaction is always greatly important to us.

Sincerely,

EarFun Customer Service Team

Don't upgrade, it will ruin your earbuds. The sound quality is now abysmal and the noise cancelling/ambient sound useless.