Firmware update for EF-E Smart Adapter and EF-E Speed Booster ULTRA (Windows)

Firmware upgrade for EF-E Smart Adapter^TM MARK IV / Mark V / CINE / eND and EF-E Speed Booster® ULTRA

CURRENT PRODUCTS

The latest firmware is available for the following models:

• EF-E Smart Adapter^TM V / CINE Smart Adapter^TM (model number MB_EF-E-BT5 / MB_EF-E-BT6)
• EF-E Speed Booster® ULTRA II / CINE Speed Booster® ULTRA (model number MB_SPEF-E-BT4 / MB_SPEF-E-BT3)
• EF-E CINE eND Smart Adapter^TM (model number MB_NDEF-E-BM7)

You have a current product if it has a slide switch on the side marked "IBIS/ON", or it is equipped with an OLED display (eND).

v75 is the final firmware release for the discontinued EF-E Mark IV (MB_EF-E-BM4 / MB_EF-E-BT4) and EF-E Speed Booster ULTRA Mark I (MB_SPEF-E-BM2 / MB_SPEF-E-BT2)

You may still download the same Metabones App below to upgrade the firmware of your Mark IV or ULTRA Mark I to v75. You have the old product if it does NOT have any slide switch marked IBIS/ON on the side.

LEGACY PRODUCTS

Legacy products made in 2014 or before have the old METABONES logo, in all UPPERCASE. They are NOT equipped with USB ports. Firmware update is by factory service only. Please email us to either send in your Smart Adapter or Speed Booster for firmware upgrade to v68, or inquire about our hardware upgrade pricing to the current Mark V. Find out more about v68 in our release notes archive.

ABOUT THIS DOWNLOAD:

• Name: Firmware update v76 (#2001) for EF-E Smart Adapter^TM MARK IV/V, EF-E Speed Booster® ULTRA and EF-E CINE eND Smart Adapter^TM 
• Release date: 1 Sept 2025
• Benefits and improvements: 
  • Fixed issue with getting stuck in manual focus if shutter is tripped while a Tamron lens is still calibrating the focus range.
  • AF illuminator is now disabled for many physically large lenses which would have blocked the camera's AF illumination light anyway.
  • Enhanced phase-detection autofocus in video mode. Check 'Enable continuous video AF, a.k.a. "Advanced" mode' in Metabones App to activate.
  • EF-E CINE eND Smart Adapter only: improved camera start-up time when manual lens emulation a.k.a. 'chip' mode is used.
  • Fixed incorrect F9.9 display with Laowa 100mm f/2.8 Macro in Advanced mode.

FIRMWARE HISTORY:

• More firmware history can be viewed in the archive: here

SYSTEM REQUIREMENTS:

Operating Systems

The latest version of the firmware update is compatible with most commonly-used versions of Microsoft Windows:

• Windows® 10 1809 or newer (64-bit)
• Windows® 11

A micro-USB cable is required to connect the Smart Adapter^TM or Speed Booster® to the computer.

While performing the firmware update, don't disconnect the USB cable, otherwise, the adapter may become inoperable due to sudden disconnection. In most cases, an adapter made inoperable by an interrupted firmware update can be fixed by performing the firmware update again.

Don't connect the adapter to any camara or lens while performing the firmware update.