刷個recovery，老是報錯：
sudo fastboot flash recovery Downloads/recovery.img
(bootloader) Variable not supported!
target reported max download size of 31457280 bytes
sending 'recovery' (6954 KB)...
FAILED (data transfer failure (Value too large for defined data type))
finished. total time: 0.028s
找了半天資料，最後測試得出原因，因為用了個1轉4usb轉接器影響的，直接用線接電腦usb口就傳輸正常了。