I was able to build it for Ender 3 V2 4.2.2.

[Ergonomicmike]

I know that this isn't the correct fork in which to make a comment about a similar fork. But since there's no way to comment in that other fork, I want to give some encouragement to @LCh-77. After four days of hacking (and I mean 'hacking' - numerous WinMerge comparisons with old Jyers, almost breaking a belt because I didn't have a stepper motor direction reversed in the config.h, etc.) I was finally tripped across this particular version of Jyers/Marlin and was able to build an updated Jyer's Marlin v2.1.x using the code from https://github.com/LCh-77/Marlin/tree/bugfix-2.1.x_JYERSUI-Update.

It looks like the 3x3 Mesh version that I had before from the old Jyer's bin, except that the icons aren't painting. (If I had to guess, as someone who doesn't know code, I am guessing that the icons aren't enumerated as they are in the old jyer's dwin.h.)

Nor are the fonts on the Home Page that identify the values at the bottom of the screen.

[LCh-77]

Ah that is because you must write #define USE_STOCK_DWIN_SET, if you have the stock icon set. It is better to use the Enhanced branch that has more features.

[Ergonomicmike]

Thanks for the quick reply.

I am using the Jyer's Gotcha icons. They worked fine with his recompiled Manual 3x3 bin. And I saw them appear briefly when I flashed your code onto my motherboard while still having TH3D's firmware on my display. It was only after I flashed my Display back to Creality (using the Jyers DWIN) that the icons disappeared. (There's also a strange problem scrolling thru the "pages." Better shown in a video.)

I think I tried the "Enhanced" branch. I couldn't get it to build. (Errors about "Row1" not being declared. Stuff way over my head.)

[Ergonomicmike]

I just downloaded the latest Enhanced version, which was updated a few hours ago (Thanks.) https://github.com/LCh-77/Marlin/tree/bugfix-2.1.x_JYERSUI-Enhanced

I builds to completion when I select the DWIN_CREALITY_LCD in configuration.h

I flashed my Ender 3 v2 v4.2.2 board and the display icons now show, albeit I don't have the Mesh stuff in the 4th placeholder where "Info" normally shows.

But when I select DWIN_CREALITY_LCD_JYERSUI I receive the following error nearing the end of the build. (It is the ONLY change to the .h file.)

Marlin\src\lcd\e3v2\jyersui\dwin.cpp: In static member function 'static void CrealityDWINClass::Menu_Item_Handler(uint8_t, uint8_t, bool)':
Marlin\src\lcd\e3v2\jyersui\dwin.cpp:3933:25: error: 'row1' was not declared in this scope; did you mean 'row'?
 3933 |               sprintf_P(row1, PSTR("%ix%ix%i"), eeprom_settings.x_bed_size, eeprom_settings.y_bed_size, eeprom_settings.z_max_pos);
      |                         ^~~~
C:\Users\20H2\.platformio\packages\framework-arduinoststm32\cores\arduino/avr/pgmspace.h:71:36: note: in definition of macro 'sprintf_P'
   71 | #define sprintf_P(s, ...) sprintf((s), __VA_ARGS__)
      |                                    ^
*** [.pio\build\STM32F103RC_creality\src\src\lcd\e3v2\jyersui\dwin.cpp.o] Error 1

I noticed, in the Jyers-Update branch that did complete when JyersUI is selected, that there are differences in the dwin.cpp file. Notably, all the stuff about JyersUIEnhanced is not in the branch that completes the build. But, as above. the jyers icons don't show for me either using this branch.)

[LCh-77]

I posted a release: https://github.com/LCh-77/Marlin/releases/tag/BLTUBL-LA Also now the Enhanced branch comes with working configuration files.

[Ergonomicmike]

Yep, I saw the new release and updated configuration files. The build errors did not pop up this time - and this was still with the JyersUI selected.

Many thanks for your hard work. (I've been at this for 3 or 4 days, hacking. I can only imagine what it must be like for you all.)