Thanks, I'd like to try it. But I'm not only unfamiliar with github navigation, but have also never yet changed the firmware on my Ender 3 V2. So I'd appreciate your stepping me through from the page you linked please:
I did try the dominant, green 'Code' link and eventually ended up with a folder called Marlin-Ender_3_V2_Extensible_UI. Is that the one? Anyway, its contents did not enlighten me!
And if I don't like it how do I revert to the original Creality firmware 1.0.2?
From the link I posted, click the link on the right hand side named releases.
I'm assuming your printer is stock so from the list download the bin file named E3V2-Default-v4.2.2.bin
If you have modified the printer by fitting a bltouch or changed the mainboard you'll have to pick the appropriate file, same if you wish to try manual mesh leveling.
Rename the .bin file as creality machines will only read and install from the file once, after that it will ignore all .bin files with the same name I just change out the v4.2.2 part and put in the date e.g. E3V2-Default-020421.bin
Place that file on your micro SD card and insert into your printer making sure the printer is powered off beforehand, switch on and it will install in a few minutes.
Once done re calibrate your esteps for your extruder.
https://teachingtechyt.github.io/index.html
This was a site suggested to me a while back by another poster here, it's a good read.
It's exactly the same with crealitys default firmware, just download it from crealitys site making sure you pick the version compatible with your mainboard. If you are unsure of your mainboard, remove the cover and check. Stock Ender 3 v2s usually ship with the 4.2.2 board.
I'll add some video links to aid you.
Firmware update.
https://youtu.be/BI269XHyAFg
An example of what you can do to level with jyers firmware, this is the manual mesh leveling but manual leveling also has a helpful menu.
https://youtu.be/9TCqQF374GU
This firmware won't improve your prints, it will however add some useful features you may wish to use. And as crealitys support for firmware seems none existent for the V2 this is one of the best ways to go if you don't wish to learn how to compile your own firmware.