SG.V2 Firmware Update
SG.V2 Headunit Firmware Update (July 2026)
THIS UPDATE IS FOR SOUNDSTREAM SG.V2 INSTALLED IN 1998-2023 HARLEY-DAVIDSON STREET GLIDE & ULTRA ONLY. ATTEMPTING THIS UPDATE TO ANY OTHER MODEL OF HEADUNIT WILL CORRUPT THE CPU; “BRICK IT.” HEAD UNITS CORRUPTED BY ATTEMPTING AN INCORRECT FIRMWARE UPDATE ARE NOT COVERED BY THE MANUFACTURER’S WARRANTY.
Release notes:
- Updates CarPlay & Android Auto protocols
- Improves FM tuning & seek sensitivity
- Adjusts brightness sensitivity & timing
- Adds a second Custom EQ
- Corrects SiriusXM equalization
- Corrects bug for album picture & metadata at Now Playing on Home
- Deletes confirmation request to open CarPlay or Android Auto after power-down from alternate mode
WARNING: Before attempting this update, please read these instructions carefully and don’t skip any steps, and be sure to use a blank flash drive (FAT32 format) from a reputable brand (SanDisk, Samsung, etc). If the flash drive is not empty, be sure to format it. You can find instructions on how to format a flash drive HERE.
A minimum 4GB or larger (32gb Max) USB Type-A flash drive with USB 2.0 or 3.0 is required. Larger flash drive sizes like 64gb or larger will not work. Using a flash drive with unknown USB specification will diminish data transfer and can corrupt the system processors. Use reliable name-brand USB flash drives. We use and recommend SanDisk Cruzer.
Update Instructions:
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Download SGV2_2607.zip from THIS LINK.
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Extract the contents of SGV2_2607.zip. Copy ISPBOOOT.BIN & the UPDATE folder with ST25MCU.BIN inside to the blank USB Type-A flash drive.
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Connect the flash drive to the USB Type-A input for SG.V2. It might be installed instead of the cigarette lighter.
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Turn on the bike to accessory power.
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After SG.V2 completes its start-up sequence, SG.V2 should display the main menu. If not, select the Home icon in the top left corner, or Back arrow in the top right corner until the Main Menu is displayed. Select the down arrow at top center to open the widgets menu.
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Select the Settings gear icon in the widgets menu, lower center left.
7. If it’s not already highlighted, select the System tab at the top left side & scroll down to and select About. This will display the current software versions of your SG.V2.
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Select the Update button at center below Device ID.
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A screen should pop-up with Current Version software information for SOC and MCU, as well as Upgrade Version available for each. The Upgrade Version for SOC should show SG.V2-260608-01, the Upgrade Version of MCU should show SG.V2-260605-01. If the correct Upgrade Versions numbers are shown, select the All Update button.
If one of the new versions is not listed, or a pop-up window appeared after pressing Update displaying “No Upgrade File Found!” double check the files on the flash drive are named correctly. The first file should be named ISPBOOOT.BIN, and a folder named UPDATE with a file inside it should be named ST25MCU.BIN. Any additional characters in the folder or file names may have caused this error message to appear. Also, delete any additional files that may have been previously hidden. Then, repeat steps 3-9.
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After a moment, the MCU Update pop-up should appear, with its progress bar. When it completes, the screen may stay blank for about 15 seconds.
11. After several seconds, the SOC Update pop-up will appear with its progress bar.
12. After a few minutes, the progress bar should reach the end and SG.V2 will restart. It is ok to remove the flash drive from the USB input after SG.V2 has restarted.
13. To confirm the update was successful, repeat steps 5-7. MCU version should now be SG.V2-260605-01. SOC version should now be SG.V2-260729-02.
If the SOC and MCU sequence do not match to the picture above, double check the files names are correct, ISPBOOOT.BIN, a folder named UPDATE with a file inside named ST25MCU.BIN. Correct the file name(s) and repeat steps 3-13. If trouble persists, contact Soundstream tech support: phone: 866-906-6866, e-mail: harley-tech@motorcycleaudio.com.
