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Autodetect AVR PART show unknow. Upload will be failed.

avrdude: AVR device not responding 
avrdude: initialization failed, rc=-1 
Double check connections and try again, or use -F to override 
this check. 

To confirm the problem by:

1/ Enable the NTB0104 level shift by set high to GPIO19: commands is as below:

echo 1 > /sys/class/gpio/gpio19/value

2/ Check if MOSI/MISO/SCK/RST hardware connection works as expect, below is the PIN mapping with the GPIOs. User can export the GPIOs in linux and run the commands as below to set high / low to GPIO. The related SPI pins will be high(+5V) / low accordingly and can be check by a multimeter. Low is 0v and high is 3.3v or 5v depends on the Arduino board.

Below is the commands need to type and check whether GPIO works.

echo 1 > /sys/class/gpio/gpio19/value   // enable level shift
echo 18 > /sys/class/gpio/export     //export gpio 18
echo "high" > /sys/class/gpio/gpio18/direction   // set direction to out and set level to high
echo "1" > /sys/class/gpio/gpio18/value   // set this GPIO to high, SPI_SCK should be high in the ICSP header.
echo "0" > /sys/class/gpio/gpio18/value   // set this GPIO to low, SPI_SCK should be low in the ICSP header.
echo 21 > /sys/class/gpio/export     //export gpio 21
echo "high" > /sys/class/gpio/gpio21/direction   // set direction to out and set level to high
echo "1" > /sys/class/gpio/gpio21/value   // set this GPIO to high, SPI_MOSI should be high in the ICSP header.
echo "0" > /sys/class/gpio/gpio21/value   // set this GPIO to low, SPI_MOSI should be low in the ICSP header.
echo 22 > /sys/class/gpio/export     //export gpio 22
echo "high" > /sys/class/gpio/gpio22/direction   // set direction to out and set level to high
echo "1" > /sys/class/gpio/gpio22/value   // set this GPIO to high, SPI_MISO should be high in the ICSP header.
echo "0" > /sys/class/gpio/gpio22/value   // set this GPIO to low, SPI_MISO should be low in the ICSP header.
echo 20 > /sys/class/gpio/export     //export gpio 20
echo "high" > /sys/class/gpio/gpio20/direction   // set direction to out and set level to high
echo "1" > /sys/class/gpio/gpio20/value   // set this GPIO to high, SPI_RST should be low in the ICSP header.
echo "0" > /sys/class/gpio/gpio20/value   // set this GPIO to low, SPI_RST should be high in the ICSP header.