Download latest Android Lollipop 5.1 stock firmware for Bluboo X550 smartphone from here or here. For how to flash Bluboo X55 read this article.
Firmware details
Archive: x550_150811
Image: 1483SFM.006D.X550.A1.L.MP3.HD.MV1616M.B158_FB13720.150811
Model: Bluboo X550 smartphone
Image file size: 611 MB
Platform: Mediatek MT6735M
Project: bird6735m_35gu_a_l
Config_version: V1.1.2
Project: bird6735m_35gu_a_l
Config_version: V1.1.2
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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