It sounds like you’re looking for a for the HTC D626h (often a single-SIM variant with a MediaTek or Qualcomm chip), possibly from a site like RepairMyMobile .

If you need guidance on or finding the exact correct firmware, I can help you identify your device’s chipset and point you toward safe sources. Just let me know what state your phone is in (e.g., no power, bootloop, can’t access recovery).