DeviceInBox

O2 Micro SD/MMC Card Reader Controller driver

Hardware ID PCI\VEN_1217&DEV_8520

Vendor
O2 Micro, Inc. (VEN 1217)
Device
SD/MMC Card Reader Controller (DEV 8520)
Bus
PCI / PCI Express
Drivers
18
Windows
Windows 7Windows 8Windows 8.1Windows 10Windows 11

Recommended driver

BayHubTech Integrated MMC/SD controller(Generic) Driver
Version 2.1.101.10740 · Mar 5, 2026 · Windows 10, 11 · 64-bit
Get driver

All drivers for VEN_1217&DEV_8520

DriverVersionDateWindowsBits
BayHubTech Integrated MMC/SD controller(Generic) Driver 2.1.101.10740 Mar 5, 2026 Windows 10, 11 64-bit
O2Micro BayHubTech Integrated MMC/SD BH-778 controller Drivers 2.1.101.10700 Apr 9, 2024 Windows 10, 11 32-bit & 64-bit
O2Micro BayHubTech Integrated MMC/SD BH-778 controller Driver 2.1.101.10690 Jan 15, 2024 Windows 10, 11 32-bit & 64-bit
O2Micro CR BH-778 Driver 2.1.101.10670 Sep 28, 2023 Windows 10, 11 32-bit & 64-bit
O2Micro CR BH-778 Driver 2.1.101.10660 Jun 25, 2023 Windows 10, 11 32-bit & 64-bit
O2Micro CR BH-778 Driver 2.1.101.10650 Jun 15, 2023 Windows 10, 11 32-bit & 64-bit
O2Micro CR BH-778 Driver 2.1.101.10640 Feb 9, 2023 Windows 10, 11 32-bit & 64-bit
O2Micro controller BH-778 Driver 2.1.101.10630 Sep 14, 2022 Windows 10, 11 32-bit & 64-bit
O2Micro controller BH-778 Driver 2.1.101.10580 May 10, 2022 Windows 10, 11 32-bit & 64-bit
O2Micro BH-778 Card Reader Driver 2.1.101.10540 Nov 8, 2021 Windows 10, 11 32-bit & 64-bit
O2Micro BH-778 Controller Drivers 2.1.101.10530 Nov 2, 2021 Windows 10, 11 32-bit & 64-bit
O2Micro BayHubTech Integrated MMC/SD controller Drivers 1.1.101.10420, 1.1.101.1025, 1.1.101.1023 May 17, 2021 Windows 10, 11 32-bit & 64-bit
O2Micro BayHubTech Integrated MMC/SD controller Drivers 1.1.1.10171 Dec 29, 2016 Windows 10 64-bit
O2Micro BH778 BayHubTech Flash Memory Card Driver 1.1.1.1013 Aug 2, 2016 Windows 7–10 32-bit & 64-bit
O2Micro OZ777 and OZ621 memory card reader Driver 1.2.2.1080, 2.2.2.1080 Nov 12, 2015 Windows 7–10 32-bit & 64-bit
O2Micro OZ777/OZ621 Memory Card Reader Driver 1.2.2.1077, 2.2.2.1077 Jul 20, 2015 Windows 7–10 32-bit & 64-bit
O2Micro OZ777/OZ621 Card Reader Drivers 2.2.2.1057 Mar 7, 2014 Windows 7–8.1 32-bit & 64-bit
O2Micro OZ777 Card Reader Driver 1.2.2.1051, 2.2.2.1051 Aug 16, 2013 Windows 7–8.1 32-bit & 64-bit

Is this your device?

  1. Press Win + X and open Device Manager.
  2. Right-click the device (often listed under Other devices with a yellow sign) → Properties → Details.
  3. Select Hardware Ids in the list. If the first line starts with PCI\VEN_1217&DEV_8520, the drivers above are for your device.

More about hardware IDs · Fix common device errors

Other O2 Micro devices with drivers