This firmware is specific to Oppo chinese version, not recommended for Oppo global version, if you are looking for Oppo Firmware Global version Please follow Link Oppo Firmware.
You Need Install PdaNet and Oppo Codemeter for flashing ofp File.
Ofp Firmware Oppo A83 & A83t Chinese Version
A83_11_A.21_180514_bee5369c.tar.bz2Type: Flash File Size: 2.6GB
SoC: Mediatek
Password: FirmwaRe27
Download via Google Drive
A83t_11_A.23_180718_128b11e0.tar.bz2
Type: Flash File Size: 3GB
Password: FirmwaRe27
Download via Google Drive