美国采购需求：电池管理系统，BMS电池，BMS模块，锂BMS，BMS锂电池，适用于Lifepo4的BMS

I'm reaching out regarding an issue with one of your products. I purchased a unit recently that has a red case, but it seems to be having difficulty connecting to the app. I've compared it with another unit I have, which connects seamlessly, so I'm quite puzzled about the discrepancy. Could you provide some insights or troubleshooting steps to resolve this issue? I'd appreciate any assistance or guidance you could offer, as I'm eager to get this unit functioning properly. Looking forward to your prompt response!