Reverting back to v6.1.9 and lost my disk array configuration

I've installed v6.2.4 but had problems with it so reverted back to v6.1.9 and now my disk array configuration is lost. If i put my disk back in their respective slot and start the array, it says that they are all unmountable and propose me to format them.

I reinstalled v6.2.4 just to see if i would get the same problem and the array is loading correctly (but still have my other issue with this version).

What should i do if i want to stay on version 6.1.9? How can i get back my array correctly?

What filesystem were the disks originally?

I had to clean a few things on my usb drive to make it work correctly. I don't know if each steps have been required but it worked for me:

[*]Deleted ldlinux.c32 ldlinux.sys, core from the root folder

[*]Copied the syslinux files from the 6.1.9 zip file to the usb drive

[*]Copied /unraid/config/super.old over /unraid/config/super.dat

[*]Had to launch "make_bootable.bat" file because i had an error on reboot

now, v6.1.9 work correctly.