Running the Windows version of 4uKey through Wine or Proton generally fails because Wine struggles to pass low-level USB DFU/Recovery connections from the host Linux kernel to the emulation layer. Method 1: The Virtual Machine (VM) Fix with USB Passthrough
If none of the above solutions work, try reinstalling 4uKey: 4ukey linux fixed
Install Windows on that partition, creating a dual-boot system via GRUB. Run 4uKey natively on the Windows side. Top Native Linux Alternatives for iOS Unlocking Running the Windows version of 4uKey through Wine