[BUG] Removing SD card at main DWIN menu screen makes Marlin splash/boot screen appear and doesn't progress to menu - Ender 5 Plus Creality V2.2 board

[BLR-IIC]

Did you test the latest bugfix-2.1.x code?

Yes

Bug Description

I had cancelled a print a few hours prior and it was on the main menu screen of my Ender 5 Plus Creality V2.2 board (DWIN display). While on the main menu screen, I removed the SD card, at which point the Marlin splash/boot screen appeared and wouldn't progress to the main menu. I thought the printer had reset, but it was still connected to Octoprint and I was still getting temperature readings.

Bug Timeline

Unsure - from Marlin source code downloaded March 21, 2026 2.1.x-bugfix. I know this wasn't an issue with Marlin 2.0.x firmware used by Insanity Automation - E5P_UBL_DW7.4.4.hex

Expected behavior

I did not expect the screen to change pages.

Actual behavior

The screen went to the Marlin boot/splash screen and remained there.

Steps to Reproduce

1. Cancel print
2. Return to main menu
3. Remove SD card
4. Marlin splash/boot screen appears and won't progress to menu screen

Version of Marlin Firmware

Marlin 2.1.x-bugfix code base from March 21, 2026

Printer model

Creality Ender 5 Plus

Electronics

Stock Creality V2.2 board - 8-bit

LCD/Controller

DWIN LCD Display

Other add-ons

Raspberry Pi 3b with Octoprint connected via USB

Bed Leveling

UBL Bilinear mesh

Your Slicer

Cura

Host Software

Other (explain below)

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

I run my prints directly from the SD card I put in the printer. I use OctoPrint as a command terminal and for remote monitoring. I also use OctoPrint to flash firmware.

Zip file contains configuration.h, configuration_adv.h, and dgus_constants.h. I included the DGUS file becuase I changed an error to a warning to bypass a check that wouldn't allow more than 5x5 UBL. I'm not sure that would be causing this problem as the menu worked fine after running 7x7 UBL through the printer.

Configuration Files E5Plus SD Card Bug.zip

EDIT: ~~I'm unsure if this is related to issue #28328 ~~ Seems this is just a UI-related issue. The printer doesn't appear to be locked up as it's responding to at least temperature commands. I haven't tried motion commands yet but I assume they'll work. I'll see about testing that if I don't get this resolved sooner. (I guess I can't do strikethrough here like Google says I can XD)

[BLR-IIC]

I duplicated this issue again this evening after a print. For kicks, I tried reinserting the SD card. Unfortunately, the Marlin splash/boot screen remained.

[ellensp]

The screen you using is "#define DGUS_LCD_UI RELOADED" but these screens also have firmware which must match the Marlin firmware talking to it. are you running the listed in marlin comments screen firmware?

* RELOADED (T5UID1)
 *  - Download https://github.com/Neo2003/DGUS-reloaded/releases
 *  - Copy the downloaded DWIN_SET folder to the SD card.

[BLR-IIC]

I'm using the DGUS-Reloaded UI located here: https://github.com/MarlinFirmware/Configurations/tree/bugfix-2.1.x/config/examples/Creality/Ender-5%20Plus/DGUS-Reloaded

I haven't tried to tweak the UI. I've only played around with the files I attached above.

After some testing with OctoPrint, I don't think the printer is locking up. I believe it's just a UI-related issue. The printer is responding at least to my temperature commands. I haven't tried motion commands, but I'm assuming they'd work.