I ordered a brand new phone, an UMIDIGI G1 Max, and everything was perfect, until it briefly lost contact with the 64gb SD card I had in it. The card contained about 46 GB of music and cartoons. Once the phone rediscovered the SD card it said it's capacity was only 2 GB and all of its contents had been replaced with a single ISO file titled ABCD.iso. I have tried four different cards from four different brands and I've gotten the same results on all of them. Two of them were new and two of them were cards that I've used reliably for several months without a problem. Each time, after mounting the card, the capacity is listed as only 2 gigabytes and, whether it was empty or not, after formatting, there still exists the single .iso file titled ABCD.iso. I have not tried a factory reset because I only discovered this problem after creating about 150 links contained in folders on my homepage that I use for work, and the thought of having to redo it all again makes me sick! I searched high and low online for information about this particular situation, but all I can find is a ransomware virus by a similar name. I want to stress that my situation is not the ransomware virus titled ABCD! Although this may be related, this is something different than the ABCD ransomware virus. I appreciate any tips or insight you may be able to provide.