Can't update with OTG port

ilmago

New member
Hi, I have a x5 mini with finless 1.2 android 4.1.1. . I want to update but otg port seems not working ( I try with several otg and micro usb cables).
How can I update? If I try to upload the image with burn card maker it says me "fail to extract F:bootloader partition from pkg" .
Many thanks for your help
 
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