Hi and welcome to the community forum.
Unfortunately it’s not generally advisable to format SD cards as an extension of internal storage, it’s best to leave them as portable storage. See the Forum guide to using SD cards. Please read it before doing anything else, so that you have a general understanding. I would also recommend informing official support of your problem (see contactsupport ). They may have more recent information and it’s important that they should know of these incidents.
You first need to get that SD card working again as internal storage if possible, so that you can salvage as much data as possible, and then re-format as portable. I would recommend the following steps to begin with:
- Turn off the phone (and don’t turn it on again until the card is back in its place).
- Remove the SD card.
- Clean the card contacts with a cotton bud soaked in surgical alcohol or isopropanol and leave to dry overnight.
- Place de card back in its slot and make sure it’s properly seated before putting in the battery.
- Turn the phone on again and see if the card is accessible again. If so, move data from the card back into phone storage.
Once data have been salvaged,
- Format the card as portable storage.
- Get advice on setting up a simple and reliable backup method for your data.