Firmware update for EF to EFM /RF(EOS R) Speed Booster ULTRA (Mac)

Firmware upgrade for Canon EF - EF-M(EOS M) and EF - RF(EOS R) T Speed Booster ULTRA^®

RELEVANT PRODUCTS

This information is for the following models:

Canon EF to EF-M (EOSM) T Speed Booster® ULTRA 0.71x (MB_SPEF-EFM-BT1)
Canon EF to RF (EOS R) T Speed Booster® ULTRA 0.71x (MB_SPEF-EFR-BT1)
Canon EF to RF (EOS R) T Speed Booster® ULTRA 0.71x CINE (MB_SPEF-EFR-BT2)

Disclaimer: these release notes only highlights significant changes to the firmware. There may have been other changes that are not documented.

ABOUT THIS DOWNLOAD

Name: Firmware update V2.40 (#1865) for Canon EF to RF (EOS R) T Speed Booster® ULTRA
Release date: 6 Jun 2025
Benefits and improvements:
- Worked around a Tamron VC lens communication synchronization bug which may negatively impact smooth iris on EOS R with some versions of camera firmware. This fix is exclusive to Metabones Speed Booster but is not possible with other adapters.
- Smooth iris with supported lenses on Komodo (experimental). Recent lens required: Canon (2009+), Tamron (2013+) or Sigma (2016+). Needs to be enabled using Metabones App beforehand. On Komodo, only Metabones Speed Booster supports smooth iris. This option needs to be disabled (which is the default) for certain lenses such as EF24-70/2.8L II USM. Note that Tamron VC is not compatible with Komodo with any adapter, unless VC is turned OFF and this smooth iris option is turned ON.
- Fixed compatibility issue with Canon EF28-105mm f3.5-4.5 on RED Komodo.
- Fixed regression of customizable button (AF stop) not working with EF28-70/3.5-4.5 II (1989), Sigma 90/2.8 Macro (1988) and Laowa 100mm F2.8 CA-Dreamer Macro 2X. Assign your desired function to the AF stop button on a supported Canon camera and push the entire control wheel inward on the Speed Booster to activate.
- Fixed issue of not being able to quit Metabones App while a firmware update is in progress. (You will have to run Metabones App again to restart the firmware update or else the adapter will be left in an inoperative state.)
- Metabones App no longer runs on Windows 7.

Name: Firmware update V1.40 (#1924) for Canon EF to EF-M (EOS M) T Speed Booster® ULTRA
Release date: 30 Jun 2025
Benefits and improvements:
- Fixed issue when Canon EF-S 18-135mm f/3.5-5.6 IS USM a.k.a. "NANO USM" is used with Power Zoom Adapter PZ-E1, the green LED of the PZ-E1 does not go off while the camera is turned off. (EF-S lenses require modification to fit Speed Booster and some do not fit at all.)

FIRMWARE HISTORY:

More firmware history can be viewed in the archive: here

SYSTEM REQUIREMENTS:

Operating System: macOS 10.13.6 High Sierra or newer.

Micro USB cable required.

DOWNLOAD INSTRUCTIONS

Important notes:

When performing the firmware update, please don't disconnect the USB cable, otherwise, the adapter may become inoperable due to the sudden power shutdown
Don't connect the adapter to any cameara and lens when performaing the firmware update.

How to download the firmware updater:

Make sure that you are logged on as a user with administrative rights.
At the bottom of the page, read the disclaimer and agree to the terms and conditions by clicking on the checkbox. Then, click on the Download button.
The download of the [MetabonesApp.dmg] file will start.
Save the file to the desktop of your computer (recommended).

RUN THE SOFTWARE

Once the file has downloaded successfully, you're ready to upgrade the Firmware update for the Smart Adapter.

STEP 1: START UP THE Metabones App

Close all currently running programs on your computer.
Double-click the [MetabonesApp.dmg] file you downloaded to start up the Metabones App.
Connect your the Smart Adapter^TM to the computer by using the USB-MicroUSB cable.
Then, follow the instructions in the Metabones App to update the firmware.

End User License Agreement (EULA)

Metabones App, hereinafter referred to as App, is licensed to you ("User") by Global Boom International Limited ("Metabones") on a single-user, non-transferable, non-exclusive, revocable basis. App shall be used only with Metabones products and only as specified in this End-User License Agreement ("EULA"). User may not reproduce, copy, rent, lease, reverse engineer, decompile or sell App or the accompanying online documentation, except to the extent expressly permitted by the EULA or by applicable law. Unauthorized use of App violates copyright and other intellectual property rights and Metabones and/or the relevant licensor (as appropriate) reserve(s) all rights. User acknowledges and understands that App is capable of reproducing copyrighted material by means of its Update function and use of said Update function on, for or with non-Metabones product(s) constitutes willful copyright infringement, subject to civil and/or criminal prosecution. Metabones does not give any Warranty with regard to the accuracy or reliability of the results or output that derives from the download, installation or use of App. Metabones does not accept any responsibility for loss of data or damage caused by the download, installation or use of App, or give any other warranty, or accept any liability whatsoever with respect to App. Metabones recommends that User (and User warrants that (s)he shall) always create and retain a copy of all data in hardware, with or in which App will be downloaded, installed or used, before downloading, installing or using App. Metabones and Metabones's Affiliates do not (except as specifically stated in an applicable EULA, if at all) offer support or assistance in using, installing or maintaining App, or resolving issues or problems that may occur as a result of downloading, using or installing App. You acknowledge that the App, and any accompanying documentation and/or technical information, may be subject to applicable export control laws and regulations. You agree not to export or re-export the App, directly or indirectly, in breach of any such laws or regulations. Where Metabones agrees (in writing) to provide technical support in relation to App or a Metabones product, it shall only provide that support on App or the relevant Metabones product in the same form and version as shipped from the Metabones or Metabones's affiliate's factory, which has not been subject to alteration, modification or abuse and which has been used in accordance with the accompanying online documentation. Metabones does not provide technical support to any non-Metabones product, notwithstanding any representation made by Metabones or Metabones' affiliates of compatibility with a Metabones product. Applicable EULA's may impose additional warranty and liability exclusions or limitations on App. The download, installation or use of App constitutes acceptance of these Terms. If you do not agree with these Terms, you may not download, install or use App or the accompanying online documentation.

I have read the above End User License Agreement (EULA) and agree to the terms and conditions.