Try the solution here if possible SerLCD 4x20 showing block characters on SPI C/S toggle - #3 by h00die and if that doesn’t work file for a return Return Policy - SparkFun Electronics
Try the solution here if possible SerLCD 4x20 showing block characters on SPI C/S toggle - #3 by h00die and if that doesn’t work file for a return Return Policy - SparkFun Electronics