: Restores network connectivity if the partition tables become corrupted.
It's not uncommon to run into issues when flashing a phone. Here's a table of common problems and how to solve them: oppo a57 cph1701ex-11-a.35 flash file
No. OPPO A57 does not support SD card flashing for full firmware. You must use SP Flash Tool. : Restores network connectivity if the partition tables