У вашего броузера проблема в совместимости с HTML5
How to Flashing & Download Firmware Oppo A71 (free no password)
Prepare download file
Driver usb : https://goo.gl/YGxGi5 (Driver MTK)
Flashtool : https://goo.gl/7REmRZ (SP Flashtool V5)
Firmware : https://goo.gl/WRhZSo
Follow the video guide how to download https://youtu.be/YQZxzr-IUOM
Fix :
-Forgot the pattern or password
-Death or Restart alone
-Cannot turn on
-Application error
-Hang
-Logo or vibrate only
How to Flash
Step 1: Download and extract the Oppo A71 stock firmware on your computer.
Step 2: After extracting, you will get the Firmware File, Flash Tool, Driver
Step 3: Install the USB Driver on your Computer (skip if drivers are already installed).
Step 4: Follow the video Guide to Flash the Firmware on your Oppo Device.
Good luck and hopefully useful... thanks for watching
wahtsaap no 03466792249