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Hi ! I recently buy modules for DIY pin2dmd https://fr.aliexpress.com/item/fashionable-best-full-color-indoor-p2-5-led-module-SMD-RGB-1-32-Scan-160x160mm-64x64pixels/32801568339.html Modules that I receive it's not RGB but GRB but, no matter, juste some wire to swap. BUT... my probleme is : When I use 5V power supply on this DMD Dmd connected with my STM32F4 Disc1 Discovery board (programmed with 2.49 Firmware of pin2dmd and upgraded from V2.J25.M14STM32 Debug+Mass Storage to V2.J29.M18) Impossible to have a correct display, only some line groupe, red, green blue... random on the display module with High luminosity. BUT, when i use a 3.3V instead of 5V to power the DMD. The display is correct. Below 3.3V, the color is not good (turn to red color) And over 3.3V, display nothing or some group of line very high very bright. With or without sd card with registration key do the same. The seller tells me that it comes from the firmware used in STM32F4 I have not yet tested old firmware version. Your opinion ? Mine it's a electric problem on this DMD but, I'm not sure. Thks a lot every body