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I'm having issues trying to recover a corrupted micro-SD card (not the data, just the card). I think it was formated to be part of the internal storage of an Android phone when that was an option.

# lsblk -f

NAME            FSTYPE   LABEL UUID                                   MOUNTPOINT

sda                                                                   

├─sda1          vfat           8F38-5495                              /boot/efi

├─sda2          ext4           1d8431cf-f298-40af-be5d-413510537953   /boot

└─sda3          LVM2_mem       mjbdHc-7AHE-LwUO-IlCo-chqH-EVhA-BVN0i4 

  ├─fedora-root ext4           d38fec65-d7d1-40e2-9d16-dcbc0dcd6330   /

  ├─fedora-swap swap           6d365505-5e51-4bd5-8a93-bcd56ed1945d   [SWAP]

  └─fedora-home ext4           3f42f95e-85ce-44a6-9abf-474bf5ae3ab6   /home

sdb                                                                   

├─sdb1                                                                

└─sdb2

-

# fdisk -l /dev/sdb

Disk /dev/sdb: 29.7 GiB, 31914983424 bytes, 62333952 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: 69704183-D789-43CC-A52A-6B69A888EA09



Device     Start      End  Sectors  Size Type

/dev/sdb1   2048    34815    32768   16M unknown

/dev/sdb2  34816 62333918 62299103 29.7G unknown

I tried fdisk /dev/sdb, it yields:

fdisk: cannot open /dev/sdb: Read-only file system

I checked the adapter and is not locked. I tried mount --options remount,rw /dev/sdb and it says:

mount: /dev/sdb: mount point not mounted or bad option.

without the remount option:

mount: /dev/sdb: can't find in /etc/fstab.

so apparently it's not mounted but still read only? anyway mount /dev/sdb1 /mnt/ does not yield an assertive error message:

mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error.

Another output I got from reading stuff on the internet:

# e2fsck -f -n /dev/sdb

e2fsck 1.44.3 (10-July-2018)

e2fsck: Bad magic number in super-block while trying to open /dev/sdb



The superblock could not be read or does not describe a valid ext2/ext3/ext4

filesystem.  If the device is valid and it really contains an ext2/ext3/ext4

filesystem (and not swap or ufs or something else), then the superblock

is corrupt, and you might try running e2fsck with an alternate superblock:

    e2fsck -b 8193 <device>

 or

    e2fsck -b 32768 <device>



Found a gpt partition table in /dev/sdb

also tried both variants suggested and got the same output.
I'm not sure how to proceed as I can't get the card mounted (tried several filesystems) or even remove the read only condition. Any ideas?