Download Android Lollipop 5.1 stock firmware for Oppo A51 smartphone from here or from here. Download to a greater extent than or less other Oppo firmware from here.
Firmware details
Archive:A51_11_A.07_OTA_007_all_wipe_201510311432
Firmware: Android Lollipop 5.1 stock
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Firmware details
Archive:A51_11_A.07_OTA_007_all_wipe_201510311432
Firmware: Android Lollipop 5.1 stock
Model: Oppo A51 smartphone
Image: A51_11_A.07_OTA_007_all_wipe_201510311432.zip
Image file size: 861 MB
Platform: Qualcomm Snapdragon 410Image: A51_11_A.07_OTA_007_all_wipe_201510311432.zip
Image file size: 861 MB
Caution: Please create non update firmware unless you lot know what you lot are doing, you lot actually desire it or it is absolutely necessary. Firmware updates may occasionally bring bad results, similar bricking your device, temporarily or permanently. The firmware update procedure is done alone at your ain risk. Before attempting to update the firmware, dorsum upwards your data.