Problem with version newer than 3.15 Ipod classic 6g

[Flopinou]

I there !
I first want to thank everyone that works on this project and everybody that might take time trying to help me !

Okay there's my problem :

I've got a 6g Ipod classic with a 160GB Hard drive and Rockbox 3.15 recently installed with bootloader 1.0 alongside the original firmware.

I saw that this version is 5 years old so I used the Rockbox utility in order to install the daily version into the ipod booted with OF. But then when I restart it tells me :
"rockbox no partition found insert usb cable"
I then tried with the developer version with the same result..
After I tried to manually install the daily version of the 01/12/2025 (the older that I could find) and got the same error

I finally came back to 3.15 and everything's OK.

Can somebody help me with that ?

Thank you very much for your attention !

EDIT : I'm terribly sorry I just saw that my post should be in GENERAL, not in HARDWARE and I don't know how to change it..