How to get recovery mode back?

[Android Central Question]

My phone is oppo neo 7 A33f. My phone was rooted before and I wanted to get custom rom so I used oppo tools to unlock bootloader but instead I accidentally pressed unroot button which was above it. Ever since then my phone cannot be rooted I tried so many apps(kingroot,kingoroot,framaroot,one click root etc.). I also realised that I cannot go into recovery mode.when I try to it shows oppo logo then goes black for less than a second and shows oppo logo again.But after waitng it comes back to normal homescreen and not recovery please help me get back recovery mode.

 

[Rukbat]

You'll probably have to reflash the ROM (back up everything first.) Try Firmware File (the instructions are included). Then root. Then restore your backup.