This is the easiest method for Windows users as it uses an app sideloading tool.
: Download a tool like Rufus and a checkra1n ISO (such as checkn1x ). Flash USB : Use Rufus to flash the ISO onto a USB drive. jailbreak ios 1257 windows
: Use a tool like Sideloadly or AltStore on your Windows PC. Connect your iPhone/iPad, drag the Chimera IPA into the tool, and enter your Apple ID to "sign" and install the app. This is the easiest method for Windows users