I have an iPad running iOS 13.1 that I need to get back to iOS 12.4. I know that Apple stopped signing iOS 12.4 so a traditional downgrade is not an option. Would doing a clean install of iOS 12.4 work? I do own CopyTrans software which I have all the data I need backed up on my iMac. At this point, is there any way to get iOS 12.4 back onto this iPad? Thank you very much for your help.