What can I say?
Biggest Kudos to dosdude1 !!! Donation sent! and well deserved
MacBook Pro 17 inch Mid 2009 5,2 17" already running Mojave courtesy of the previous version.
Please note that the Finder "weird greys" do appear if you install Catalina from scratch by my upgrade from 10.14.6 to 10.15 does keep the correct whites perfect, proof below.
First I upgraded the APFS to native capable booting machine :
*selected the 2nd option based on my chip
View attachment 867826
Had to look for it but it's there... if you are growing old you'll find issues reading the code lol:
View attachment 867828
The APFS patcher took 10 very tense minutes to upgrade the firmware, but it did the job!!!
View attachment 867830
Now, booting without the need of the APFS patch and Finder's colours correct:
View attachment 867832
Quick tip, after you start the computer holding the Option for the list of drives and then release, if you click and hold "ctrl" the icon will change and it will remember to boot from that drive, used that to skip the APFS patcher / helper at all.
Thanks!