You lost your EFS. Restore the EFS backup you made in TWRP. If you didn't make one, you must flash stock Samsung firmware via Odin immediately.
: Ideal if you want your J5 to look and feel like a Google Pixel, complete with Android 10 gestures and a clean UI.
Flashing will completely wipe your phone. Back up your photos, contacts, and documents to a PC or cloud storage. samsung galaxy j5 2016 custom rom link
I can point you toward the most stable thread active right now. Share public link
Flashing a custom operating system requires structural changes to your device software. Ensure you back up all vital personal data before initiating this sequence. Phase 1: Prerequisites You lost your EFS
: Another option for users looking for a modern Android experience with additional customization features. community.e.foundation Key Installation Requirements
Elevate Your Experience: Top Custom ROMs for Samsung Galaxy J5 2016 (SM-J510) : Ideal if you want your J5 to
LineageOS 18.1 for J5 2016 (XDA Developers Thread) Look for the latest build link in the first or second post.