Phone is no longer reading my sd card on HTC Hero - getting error "The SD card is blank or using an unsupported f"

How to fix an HTC U12/U12 Plus that cannot read SD card, SD card not detected error [Troubleshooting Guide]

1. First solution: Reboot or soft reset your phone.
2. Second solution: Unmount microSD card then reseat it.
3. Third solution: Erase or format microSD card.
4. Fourth solution: Update phone software to the latest version.

https://thedroidguy.com/how-to-fix-an-htc-u12-u12-plus-that-cannot-read-sd-card-sd-card-not-detected-error-troubleshooting-guide-1088446

Never

you need to purchase a micro-sd card to expand the memory.

Is your computer able to read the card with an SD adapter? If so, back up any information on it to the computer. Put card back in phone and go to settings->storage->unmount SD card->then format SD card. Allowing the phone to format the card usually has better results than formatting it in Windows because it's going to use the correct file system type.

Hope this helps

Ray

Hi jerilee436,
Let's start with easiest thing first... Take out your SD card and re-insert it and see if your phone picks it up. (If you don't already know this is how you locate the SD card: http://www.fixya.com/support/t8475945-g1_memory_card_slot)
If that doesn't work, you can try putting your SD card into a card reader (You may already have one on your computer. However, if you don't ask try asking a friend if they have one OR you can purchase one from here: http://www.amazon.com/Sandisk-MobileMate-Plus-Memory-Reader/dp/B000Q3IUV2). If the card works in your computer try formatting it and putting it back into your phone. Still doesn't work? Try a different SD card in the phone. If that ALSO doesn't work then you likely have a bad card reader in your phone :'( You'll have to call up your cell phone provider and see what they can do from there.
Hope that helps!

Unmount SD card
Format your SD card using the phone SD card

Its in the manual. If you don't have one download it from HTC. It answers a lot of questions. You'll also might need to download HTC sync from their website as well. But you'll need to plug the phone into a usb port with the cable that came with the phone. When the computer sees the phone then you have to unmount the sd card. There will be a notice in the notifications bar on the phone. Just click unmount. it should show up as a drive on the computer. just remember MOUNT the sd card again BEFORE you unplug it from the computer. You could trash the sd card!!

First you want to go into your phones settings from there find the title labled ' SD card & Phone Storage'. Then choose Unmount SD card this allows for your card to be safely removed without losing any Data. Then slide the back cover off your device look for 'MicroSD' written on your right side and gently press the card in, it should come out fairly easy.

i was having the same problem and i went to settings then to sd card and clicked on Unmount SD card and i took out the sd card, then placed it back into my phone and now i can take pictures and video :]