For oppo a57:

1 OPPO A57 2 OPPO A57

For oppo a77:

2-OPPO-A77 4-OPPO-A77 7-OPPO-A77 8-OPPO-A77 9-OPPO-A77 10-OPPO-A77 11-OPPO-A77 12-OPPO-A77 14-OPPO-A77 15-OPPO-A77