I tried a custom firmware but it didn't work and my phone kept restarting on boot. After 2 days I ended up installing an original firmware but my Samsung services more importantly "secure folder" is not working due to security reasons. I was wandering if you could help me fix that. My phone is A7 2018
I tried cash erasing and flashing my phone with an official rom. it has the latest update.
but still the problem is remained.
Thanks for reaching out. This forum is for the support of US products and customers. As your product is a non-US model and the support for these models is very limited, please seek a support team for your area. You can do so by using this link: http://www.samsung.com/visitcountry
@Amir1904 You'll want to reach out to your countries support group for help here! --> http://www.samsung.com/visitcountry
As well, here is some troubleshooting on Samsung's Knox that may help.