If you can load it on a linux vm, you can use fsck -v /dev/mmc0
to try to repair it.
Android
DROID DOES
Welcome to the droidymcdroidface-iest, Lemmyest (Lemmiest), test, bestest, phoniest, pluckiest, snarkiest, and spiciest Android community on Lemmy (Do not respond)! Here you can participate in amazing discussions and events relating to all things Android.
The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:
Rules
1. All posts must be relevant to Android devices/operating system.
2. Posts cannot be illegal or NSFW material.
3. No spam, self promotion, or upvote farming. Sources engaging in these behavior will be added to the Blacklist.
4. Non-whitelisted bots will be banned.
5. Engage respectfully: Harassment, flamebaiting, bad faith engagement, or agenda posting will result in your posts being removed. Excessive violations will result in temporary or permanent ban, depending on severity.
6. Memes are not allowed to be posts, but are allowed in the comments.
7. Posts from clickbait sources are heavily discouraged. Please de-clickbait titles if it needs to be submitted.
8. Submission statements of any length composed of your own thoughts inside the post text field are mandatory for any microblog posts, and are optional but recommended for article/image/video posts.
Community Resources:
We are Android girls*,
In our Lemmy.world.
The back is plastic,
It's fantastic.
*Well, not just girls: people of all gender identities are welcomed here.
Our Partner Communities:
Might also want to make an image of the device with dd if=/dev/DEVICE-NAME conv=sync,noerror bs=128K > sd_card.img
first. It's often a good practice to make a raw backup before doing anything that changes the device.
If it's that important, send it to a data recovery company and pay them. I'm sure this would be an easy job.
I had no backup, as I always considered my MicroSD as an external storage medium for such data.
I know you're not looking for advice that would have been great before things went wrong, but... When they say to have a backup up on external storage, they don't mean make the backup and then delete the original. Then the "backup" is just the original.
Also, I don't think that microSD life expectancy is that great. I wouldn't it trust it as a sole keeper of backups.
Good luck.
This. The way I think of it, if data isn't backed up, that data doesn't really exist. At a bare minimum, keep important data backed up in two separate locations. Ideally you should follow the 3-2-1 backup rule (a main drive, backup drive, and cloud backup fulfill the requirements).