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Forum : Digole Serial Display : 12864 LCD/OLED module :

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How to fix a garbage screen on boot and can't connect.

 hi

i have a 0.96" OLED screen that had a firmware of 4.2B

In trying to set a startup screen, It is now showing a garbage screen on boot up and i can no longer communicate with it. It seems that i did something wrong.

The board says c:4.7u. 

is it possible to reflash the firmware using the instructions at http://www.digole.com/forum.php?topicID=653 to get things working again?

Thanks lots

RE:How to fix a garbage screen on boot and can't connect.

Yes, you can use "Hard" way to force the display enter boot loader:

1) connect VCC, DATA and GND to a USB->UART adapter, the DATA pin connect with TX pin on the adapter, but don't plug it to computer (power off)

2) short the DATA pin to GND, and keep that.

3) plug the adapter to computer (power on)

4) reset the display by short the rectangle pad on the PCB to GND, and open the short.

5) open the DATA from GND

Now the display supposed enter bootloader.

6) run coolterm and config the adapter at 57600-8N1

7) transfer the firmware to DATA pin

If the display upgraded success, you can see Digole's welcome screen now, if not, please try above steps again.

The display was check the DATA pin when hard reset (not when power on), if DATA pin was low, then wait it go high and then enter boot loader. another way to enter bootloader is using "BLUBL}" command if the display still accept data.

All firmwares here:

http://www.digole.com/fw/

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