
First, download firmware below after that extract them all. There are 2 folder after you extract them.
Execute first folder (A1601_step1) flash normally (with download option) and if necessary just do safe format before.
If the first step was success now, its time to continue to second step. Open (A1601_step2) folder and execute DownloadTool_1612.8.exe. Scatter will automatically open and now select third options in download mode, and type password: oppodeve (see below picture)

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Firmware Oppo F1S 100% fix and works!