Suddenly I discovered that all my MicroSDs which were not compatible with Tracker OG are now usable. Solution was easy: if you have any PSP (100x, 200x, 300x) (I used my 3006 model), just format this MicroSD with PSP and then drop your files here from PC. PSP formats it to FAT32 32kb cluster size. You can do the same in Windows, but IT WONT WORK. I try to find why this solution is working and what is the cause of not-readable MicroSDs, but shared info I gathered to this moment.
OK!
Maybe I found the antidote!!
To format a 64 GB card, I used this video: https://ww w.youtube.com/watch?v=IceA1OxEFa4.
It’s free and easy.
I used a Fat 32 32Kb format.
I verified an important thing:
THE TRACKER DOES NOT RECOGNIZE THE SD CARD IMMEDIATELY, YOU MUST INSERT IT AND WAIT WITH THE MACHINE OFF AND THE POWER SUPPLY INSERTED.
If I try to turn on my Polyend immediately, the SD is not recognized.
I will do some more testing and update you.
Using my method you can power on your Tracker immediately. It is something about formatting procedure or data allocation during formatting using old devices
Sandroid wrote a nice guide for formatting +32Gig SD cards which might be useful here.