A number of OnePlus 7 Pro owners have recently received a couple of rather confusing push notifications, seemingly from OnePlus itself. The good news is, it’s nothing to worry about.

The spam notifications, which appear to be made up of a random selection of characters – with some in Chinese, and others in Latin – have been leaving customers a little confused.
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https://www.techradar.com/news/oneplus-7-pro-owners-get-garbled-push-notification-but-its-just-a-oneplus-error