Direct links for SP Flash Tool (2017) Download: (you need this new tools)

Oppo F1s bypass screen lock pattern ok by Flash Tool

Method 1 : erase by flashtool Only

Download PATTERN_RESET.rar 48.1 Mb

Direct links for SP Flash Tool (2017) Download: (you need this new tools)

Method 2 :
 Switch off the OPPO F1s phone
Press the Volume Down button and Power button together for few seconds
Select the language by pressing the Power button
Use the Volume up/down buttons to navigate between the options
Select ‘Wipe Data / Factory Reset’ by pressing the Power button
Select ‘Yes’ by pressing the Power button
Use the Volume up/down buttons to navigate between the options
Select ‘Yes – Reboot Now’ by pressing the Power button
The phone is now formatted and ready to use.

Method 3 :

Turn on OPPO F1s mobile, navigate to Settings.
Look for Backup & reset option and select the same.
Tap the Factory Reset option.
Select Reset Device.
Select ‘Erase Everything’ and wait till the phone gets rebooted with fresh set of data.

WARNING : Hard Reset will erase all your data, Kindly Be Careful.