I don't know if I should ask this.. but I'm kinda lost so..
My lcd is showing the error and not the messages I want it to, no problem with the enable pin and all. Do you if anything else is the problem?
controller damaged
They are brand new.bought them a few days ago
awesome, refund it.
Those squares are the Power On Self Test (POST) indication. Useful for setting brightness.
Check your wiring. Do these have the I2C backpacks? Those are MUCH easier to get working. This is not a "fail" indication on the LCD itself, but wiring or code not correct.
this is normal POST for 1602
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