Before to have the problem my mac had 2 main partitions, on the first one there was installed osx and on the second one linux. Yesterday I did cmd+r but in the while, the charger was not attached to my mac and it died. Since that moment at startup, no filesystem exists anymore and there are some problems with partitions.
Now, what I want to do is getting back my data from osx partition and I made some attempts till now without some success:
1) I run cmd+r (it was restored the original recover system from internet) -> disk utility -> partitions cannot be mounted and the mac osx partition type Is marked with a strange name like FFFFFF (like shown in the picture above). From disk utility seems to be nothing to do so...
2) ...I created a bootable USB using a Linux iso(redo Recovery) and I run it trying to recover my data with some program. First of all, I cannot mount the volume where osx is located, I tried to recover my data with Gparted but it says no filesystem has been found. I tried also testdisk, it founds a lot of partitions but till now I was not able to recover anything yet:
Typing P, TestDisk is not able to find data anyway (it says can't open partition file system seems to be damaged or no file found, the file system may be damaged)
Note that the operating system installed was Catalina (for the osx partition)
So, what can I do to recover my file from that osx partition? Thanks