Follow these methods in order. Most users will succeed by Method 1 or 2.
Xidol does not maintain an official public driver repository, but the K5188 often uses a driver package named Xidol_K5188_UMTS_Driver_v2.1.exe or similar from resellers.
Steps:
Expected result: Windows installs "Xidol K5188 Modem" under "Modems" in Device Manager.
Driver Name: Xidol K5188 Fixed Driver Pack File Size: Approx. 15MB Compatible OS: Windows 7, 8, 10, 11 (32-bit & 64-bit)
[DOWNLOAD DRIVER XIDOL K5188 FIXED] (Link Placeholder: Insert your Google Drive, Mediafire, or official source link here) Password (if needed): techsupport
This specific driver package addresses several legacy code bugs found in the original installation CDs: