There's a WhatsApp backup on my Windows 10 mobile's memory card that won't go away and it's taking up over 6GB of storage space. I've tried many times to delete the folder and the sub folders + files individually through File Explorer on my phone and on a PC, I've reinstalled the app several times fiddling around each time (trying to get a brand new backup, not restoring backup, etc) and I've soft reset my phone a couple times (tried re-inserting my memory card). Nothing works and the sub folders and files appear to be non-readable with strange names and dates.
Should I do a factory reset, get a new memory card or is there some other way around this?
Edit: My phone isn't interop unlocked and I would prefer not to do that.