SG.V2 Firmware Update — July 2026

Firmware release: July 2026

Check the About screen at step 7 before you start — the version numbers name the model. If yours begin SG.V2, you're on the right page. If they begin WHDSG you have the earlier WHD.SG; if they begin V2 you have the HDHU.V2 for 2014–2023 Touring.

What this update fixes

• Updates the CarPlay & Android Auto protocols
• Improves FM tuning & seek sensitivity
• Adjusts brightness sensitivity & timing
• Adds a second Custom EQ
• Corrects SiriusXM equalisation
• Fixes the album artwork & metadata bug on the Now Playing home screen
• Removes the confirmation prompt to open CarPlay or Android Auto after powering down from an alternate mode

Before you start

You need a blank USB Type-A flash drive that meets all of the following:

A flash drive of unknown USB specification will slow data transfer and can corrupt the system processors. If the drive isn't empty, format it first — here are instructions for formatting a flash drive in Windows.

The download is 152MB, so do that part on Wi-Fi before you head out to the bike. The update itself runs for a few minutes on the head unit, and it must not be interrupted — make sure your battery is healthy or the bike is on a tender.

Update instructions

Download SGV2_2607.zip
152 MB — download on Wi-Fi

1. Download SGV2_2607.zip using the button above.

2. Extract the zip. Copy ISPBOOOT.BIN and the update folder — with st25mcu.bin inside it — to the blank USB Type-A flash drive.

   This download has a stray file in it — delete it. Inside the update folder, alongside st25mcu.bin, you may see a second file called ._st25mcu_1.bin. It is left-over packaging junk, not part of the firmware. Delete it from the flash drive before you continue, or the SG.V2 is likely to report "No Upgrade File Found!". Mac users won't see it (it's hidden); Windows users will.

   Don't rename anything else. The folder and the MCU file extract in lower case — update and st25mcu.bin — while the screenshot below, taken on an earlier build, shows the folder in capitals. Either is fine: the flash drive and the head unit both ignore capitalisation. What matters is that the spelling is unchanged and nothing extra has been added to the names.

   Once the stray file is gone, the two remaining items must sit in the root of the drive, with nothing else on it:

   

   On a Mac: extracting the zip also creates a hidden __MACOSX folder. Delete it from the flash drive too.

3. Connect the flash drive to the USB Type-A input for the SG.V2. On these bikes it is often fitted in place of the cigarette lighter.

4. Turn the bike on to accessory power.

5. After the SG.V2 completes its start-up sequence it should display the main menu. If not, select the Home icon in the top left corner, or the Back arrow in the top right corner, until the main menu is displayed. Select the down arrow at top centre to open the widgets menu.

   

6. Select the Settings gear icon in the widgets menu, lower centre left.

   

7. If it isn't already highlighted, select the System tab at the top left, then scroll down to and select About. This displays the current MCU and SOC software versions of your SG.V2.

   

8. Select the Update button, centre, below Device ID.

   

9. A screen pops up showing the Current Version for SOC and MCU, alongside the Upgrade Version available for each. Check that:

   • SOC Upgrade Version reads SG.V2-260608-01
   • MCU Upgrade Version reads SG.V2-260605-01

   If both are correct, select All update.

   
   Version not listed, or "No Upgrade File Found!"? First check you deleted ._st25mcu_1.bin from the update folder — on this model that's the most likely cause. Otherwise, double-check the file names: there must be a file named ISPBOOOT.BIN — note the three O's — and a folder named update with a file inside it named st25mcu.bin. Capitalisation doesn't matter, but any extra characters do. Also delete any other hidden files, including the __MACOSX folder. Then repeat steps 3–9.

10. After a moment the MCU Update pop-up appears with a progress bar. When it completes, the screen may stay blank for about 15 seconds. This is normal — don't touch anything.

    

11. After several seconds the SOC Update pop-up appears with its own progress bar.

    

12. After a few minutes the progress bar reaches the end and the SG.V2 restarts. Once it has restarted you can remove the flash drive from the USB input.

13. To confirm the update was successful, repeat steps 5–7. You should now see:

    • MCU: SG.V2-260605-01
    • SOC: SG.V2-260608-01
    

If the versions don't match

Double-check that the file names are correct — ISPBOOOT.BIN, and a folder named update with a file inside named st25mcu.bin, with no stray ._st25mcu_1.bin. Correct the drive contents and repeat steps 3–13.