my file manager app lock box password how to forget
Back-up your data, and move it to a pc or the cloud, then do a factory reset.
how to backup my locked files ?
Don't know, those might be lost. But try using the OnePlus Switch app for back-up, and do not back-up apps and system settings. Then see what happens after a factory reset. You can also try contacting OnePlus customer service.
Data in LockBox is encrypted. You should first unlock the LockBox and move the data out if you wish to be able to back it up in a fashion you can use it later.
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