No reaction when I plug connect phone with pc at bootloader

[MengFei]

Only the  first time I the screen shows it is connected to pc and I can
download kernel or rootfs to phone. Now there is no reaction. I have no idea
on how to update the kernel and rootfs.

-- 
Fei Meng
Dept. of Computer Science
National Tsing Hua University
Hsinchu 30013, Taiwan
Dorm: Chai Yi 418; Tel: 0086-972-1464
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