If they are dead they are dead - you can't repair them.
1 of them became 30MB the other one is not recognized by anything.
Posts by Cow
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Run Rufus but without selecting any image, just press start. It worked for me numerous times.sent from my G2
Will try
[hr]
SD format didn't work Rufus also failed to work. also did the diskpart & sadly it wont. i got 2 micro sd cards both brand new from Sandisk. both are "dead" -
Same issue here for me. Tried with rufus & also the image provided here but the sd is still on 31MB