TWRP v3.4.0-1_nullcode

XDA thread for feedback https://forum.xda-developers.com/t/recovery-unofficial-twrp-3-5-0-1-for-samsung-galaxy-j2-2016.4194407/
Everything tested on my phone

Working: Almost all
Bugs: MTP, USB Mass Storage (uploading fixed build shortly)

Flash the image through the existing recovery
Flash the tar file through Download Mode (ODIN)