Oppo A57T

A57T_11_A.21_170902.rar, Size 1.34 GB...
https://drive.google.com/open?id=1dC7tBbl2f2xhJ7bO3zwe-RsqKWx-3IuC
Files in rom, tool and driver
If you just want to remove the screen password, download the file  prog_emmc_firehose_8937_ddr_oppo_a57t.mbn  ( MAX SPEED LINK )
prog_emmc_firehose_8937_ddr_oppo_a57t.mbn, Size 397.63 KB...
https://drive.google.com/file/d/1VA0KE1UjZ1XL36RTRtBP1ZpWeFioF7cw/view
and follow the instructions in this article.

Oppo A57T All Fix Firmware
-Oppo A57T (Only)
-MSM8937
-V6.0.1
http://advertisingnewsidea.blogspot.com/2018/10/oppo-a57t-all-fix-firmware.html